Comparison

Slayin vs Kepler Attack

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Slayin

Embark on an endless action RPG adventure with charming retro graphics and a captivating chiptune soundtrack. Choose from multiple heroes, battle monsters, and collect powerful gear and spells. Be warned, death is permanent in this challenging and rewarding quest to become a true hero.

Highlights
  • Endless action RPG gameplay
  • Multiple playable classes
  • Monster and boss battles
  • Loot collection (weapons, armor, spells)
  • Challenging quests
  • Retro pixel graphics
  • Chiptune soundtrack
Features
Read full description

PREPARE FOR THE WORLD’S FIRST ENDLESS ACTION RPG Slayin will test your skills like no other endless game on the App Store. Don’t get yourself fooled by its charming retro graphics and motivating chiptune soundtrack. In this game, death lurks behind every corner! Your task sounds all so simple. First choose from one of three heroes: knight, wizard and knave. Then slay as many monsters as possible, while leveling up and getting more powerful equipment and spells along the way. But there’s a catch: once you die, you’re gone for good! On your journey you will travel through numerous locations and encounter dozens of different monsters and fearsome bosses. Eventually, you will even have to face the giant dragon of legend. But he will not part with his treasure easily. Only the most worthy adventurers will be able to complete this task and become a true hero. Get ready for some slayin! • World’s first endless action RPG • Challenging and rewarding • Pixel perfect retro graphics • Chiptune soundtrack by Matt Creamer (Retro City Rampage) • 6 unique playable classes: knight, wizard, knave, archer, tamer and ninja • Endless loot: tons of weapons, armor and spells • Face legendary monsters and bosses • More than a hundred challenging quests to master • 3 unique game modes • Compete with your friends on Game Center

About

Kepler Attack

Engage in a retro arcade space shooter experience on your iPhone and Apple Watch. Destroy waves of alien invaders with power-ups and intuitive controls. Enjoy fast-paced gameplay perfect for short bursts of fun.

Highlights
  • Space shooter gameplay
  • Alien invasion waves
  • Power-ups (Shield, Triple Shot, etc.)
  • Apple Watch Crown controls
  • iPhone swipe controls
  • Retro arcade graphics
  • Short burst gameplay
Features
Read full description

Featured in Apple's "Great on watchOS 6" and "Our Favourite Apple Watch Apps" collections! #2 Casual Game in the US! Kepler Attack is an arcade game for your iPhone and Apple Watch. Fly through space and destroy waves of alien space invaders from Kepler-452b. “I’m just amazed that this is on my Watch.” - Tom, host of The Apple WatchCast Podcast - http://www.applewatchcast.com “I think this is actually my personal favorite new game now on the Apple Watch because of its really fast pacing which is perfect for these types of games.” - HotshotTek, 10 Awesome Apple Watch Games Apps of 2019 • Inspired by Gyruss, Galaga, Galaxian and Space Invaders! • Beautiful retro arcade graphics! • Fast paced alien attack waves with a variety of enemy space invaders! • Power-ups include Shield, Triple Shot, Rapid Fire and Smart Bomb! • Intuitive and simple controls using the Crown on the Watch! • Swipe to move on the iPhone! • Short burst gameplay is perfect for the Watch and iPhone! • Retro sound effects on the iPhone! • Play anywhere, anytime! • Includes Valentine's Day and Santa Christmas Holiday theme! • Runs at 60fps on the Watch! Relive the glory days of the arcade on your Apple Watch and iPhone. Thanks for playing Johnno & Pete

Screenshots

Slayin4 screens
Kepler Attack4 screens

Verdict

The call

The clearest difference is in-app purchases: Kepler Attack at none against Slayin's 3. Kepler Attack also leads on update cadence (every 2 months vs every 10 months) and chart position (#54 vs unranked). Slayin's advantage is review sentiment (89% vs 81%) and ratings volume (3.1K vs 943). On rating, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Slayin costs $0.99 and Kepler Attack $1.99 up front. Slayin sells 3 one-off in-app purchases. Kepler Attack asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Slayin holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 3.1K and 943 respectively. Written reviews point the same way: 89% of Slayin's written reviews are positive against 81% of Kepler Attack's.

UpkeepUpdate frequency

Slayin ships an update every 10 months, Kepler Attack every 2 months. The most recent releases landed on October 29, 2026 and October 26, 2026 respectively.

Scorecard8 real differences · 3 level
Slayin versus Kepler Attack: the parameters behind the verdict, then further details
ParameterSlayinKepler Attack
Price$0.99 — better$1.99
Rating4.7 (3.1K ratings) — better4.5 (943 ratings)
Positive reviews89.4% of reviews — better81.4% of reviews
Number of ratings3.1K — better943
Update frequencyEvery 10 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank—#54 — better
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS8.0 — better17.0
Further details — not scored
Size21 MB17 MB
Age rating12+4+
DeveloperFDG Entertainment GmbH & Co.KGRed Sprite Studios

Customer experience

Slayin

All ratings3,062 ratings
Positive94.3%
Neutral2.9%
Negative2.8%
Written reviews1,839 reviews
Positive89.4%
Neutral4.4%
Negative6.2%

Kepler Attack

All ratings942 ratings
Positive87.6%
Neutral5.5%
Negative6.9%
Written reviews43 reviews
Positive81.4%
Neutral7.0%
Negative11.6%

User reviews

Slayin

From 3.1K App Store ratings

What we love

  • 💎 Perfect game
  • 🎮 Fun and addictive gameplay
  • 🕹️ Retro and nostalgic feel
  • 💰 Great value for money
  • 🕰️ Timeless classic

Room to improve

  • 🐛 Crashes and compatibility issues
  • 🔧 Needs updates for newer devices
  • 💰 Grindy progression system
  • 🕹️ Repetitive gameplay

Kepler Attack

From 943 App Store ratings

What we love

  • 😁 Great for apple watches
  • 🎮 An actual video game
  • 🎶 What's the music called?
  • 📱 I love the fact that you can play this game on an Apple Watch
  • ⏱️ Old School Arcade Immediacy and Brevity

Room to improve

  • 🙄 Not worth paying for
  • 💰 Ain't worth the money really
  • 🙄 Fun but basic
  • 😒 Stupid forced reviews
  • 🐛 Won't install

Bugs and requests

Slayin

Reported bugs

4 issues
  • Ninja character invisibility bug
  • Archer character issues
  • Game not loading on some devices
  • Sound issues

Requested features

4 requests
  • Multiplayer mode
  • More characters and content
  • Fullscreen mode for modern devices
  • Save/load progress across devices

Kepler Attack

Reported bugs

5 issues
  • Game doesn't play complete rip off
  • Just says on the watch version that it has to be installed on my iPhone for it to work. It's installed on my iPhone. Doesn't work.
  • This seems like a good game but I don't see it on my watch.
  • I have the first version watch Apple one, and it does not work on the watch,And has offered me a refund, I appreciate it.
  • It won't download on my watch

Requested features

2 requests
  • Add a golden starship IF
  • Please add upgrades so we can have bettr ships

In-app purchases

3 purchases

Slayin

One-time3
  • Bard's Poem$0.99
  • Bard's Sonnet$2.99
  • Bard's Epic$5.99
None

Kepler Attack

No in-app purchases

Questions

Is Slayin free?
Slayin costs $0.99, and also offers in-app purchases.
Is Kepler Attack free?
Kepler Attack costs $1.99, with no in-app purchases.
Which has better reviews, Slayin or Kepler Attack?
Slayin is rated higher. Slayin averages 4.7 out of 5 from 3.1K ratings, while Kepler Attack averages 4.5 from 943 ratings.
Do Slayin or Kepler Attack have ads?
Neither Slayin nor Kepler Attack shows ads.
Which is updated more often, Slayin or Kepler Attack?
Slayin ships an update every 10 months, and Kepler Attack every 2 months. Most recently, Slayin was updated on October 29, 2026 and Kepler Attack on October 26, 2026.

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