Comparison

Evolvace E2 vs Ocean Keeper

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

Head to head
About

Evolvace E2

Features
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Evolved online real time showdown shooter.  The marvelous battle between Evolvace E2s which surpass Evolvace begins.  More unique battleships which evolved to E2.  In addition to E2s, all E1s appear. Battle of the 12 battleships. Can you beat the E2s with the E1s?  Solo, watch, local match, and world match are all featured.  'Evolvace' was just the begining.  The marvelous E2's appear!!! The overwhelming destructive power!!! Which battleship is the strongest???  GuardaceRE E2・・・Cross RemzE2 equipped. Having both the high attack power and the high defensive ability.  EvolvaceP E2・・・The docking type RemzP E2 equipped. Having the overwhelming destructive power.  EvolvaceD E2・・・Hyper Gravity Shield equipped. Having the ultimate defensive system undetectable.  EvolvaceR E2・・・Decimal RemzR E2 equipped. The strongest 360°Remz attack clear enemies up.  EvolvaceS E2・・・New weapons equipped. A combination of a variety of attacks causes the ruinous destruction.  EvolvaceM E2・・・The 2nd edition of Dark-matter Energy Generator equipped. Ruling the space, it gets the dark fort.  Why do Evolvaces have to evolve?  What is the new enemy that Guardace is menaced by.  The conclusion of Resurrace trilogy!!!

About

Ocean Keeper

Explore procedurally generated underwater caves as a crashed miner in this roguelike shooter. Dig for resources, battle hordes of sea monsters, and upgrade your mech and weapons to survive. Each playthrough offers a unique challenge with changing layouts and diverse bosses.

Highlights
  • Procedurally generated caves
  • Mech customization
  • Horde battles with monsters and bosses
  • Meta-progression system
  • Artifact system
  • Multiple weapon choices
  • Diverse biomes
Features
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A roguelike shooter with a top-down view where you play as a Miner whose spaceship has crashed on a planet, filled with underwater monsters! Use the time between each attack to power up your diver, mech, or weapon. Build automatic turrets, use drones to gather resources and improve your skills to increase your chances of survival. Discover mysterious locations and fantastic undersea deep biomes. EACH time you explore the underwater worlds, the layout changes, making every journey unique. You never play the same scenario twice in this drill dungeon core roguelite. Ocean Keeper: Dome Survival Features: * Procedurally generated caves: each dungeon you enter is unique. * Mech customization: Upgrade and personalize your Submarine Mech. * Underwater casual game with roguelite and roguelike elements. * Horde Battles: Fight waves of sea monsters and bosses. * Meta-progression: Constant upgrades and new abilities for your survivor. * Artifact System: Unlock and equip powerful artifacts. * Multiple Weapons: Choose from a huge arsenal of weapons. * Diverse Bosses: Slay unique and challenging alien bosses. * Multiple biomes: Explore different underwater dungeons. - How to Play Ocean Keeper: Dome Survival: Play with two hands and swipe your finger across the screen to move the diver in any direction, or use the virtual joystick. Find a mine (a deep hollow lighted in blue), dive into it and start digging to find resources. Since you don't have a backpack, you need to drag the resources yourself up to the mech. Get out of the mine as soon as you hear the sound of an attack or see the timer expire. Attack aliens by aiming at them and firing bullets. Collect various resources to unlock powerful upgrades: improve your weapons, increase the impact of your drill, boost your jetpack's max speed, and many other upgrade paths - each of which gives you and your dome the best chance of survival until dawn! - Join The Fans of Ocean Keeper: Dome Survival: Join our community and become an part of Ocean Keeper: Dome Survival development! In our Discord, you can chat directly with our developers, share your valuable feedback, and have a real impact on the final version of Ocean Keeper: Dome Survival roguelike game.

Screenshots

Evolvace E24 screens
Ocean Keeper4 screens

Verdict

The call

The clearest difference is price: Ocean Keeper at Free against Evolvace E2's $4.99. Ocean Keeper also leads on update cadence (every 4 days vs every 8 months) and iOS requirement (12.0 vs 15.6). Evolvace E2's advantage is ads (none vs shown). On in-app purchases 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

Ocean Keeper is free to download; Evolvace E2 costs $4.99 up front. Evolvace E2 sells 2 one-off in-app purchases and Ocean Keeper sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Evolvace E2 ships an update every 8 months, Ocean Keeper every 4 days. The most recent releases landed on October 24, 2026 and October 23, 2026 respectively.

Scorecard4 real differences · 6 level
Evolvace E2 versus Ocean Keeper: the parameters behind the verdict, then further details
ParameterEvolvace E2Ocean Keeper
Price$4.99Free — better
Rating—4.4 (290 ratings) — better
Positive reviews—48.0% of reviews
Number of ratings—290 — better
Update frequencyEvery 8 monthsEvery 4 days — better
AdsNo — betterYes
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.612.0 — better
Further details — not scored
Size87 MB272 MB
Age rating4+9+
DeveloperTetsuyoshi MorikawaRetroStyle Games

Bugs and requests

Evolvace E2

Not enough reviews yet to summarise bugs or requests.

Ocean Keeper

Reported bugs

3 issues
  • Game not loading after purchase
  • Upgrade options not functioning as expected
  • Progress not saving across sessions

Requested features

4 requests
  • More items and upgrades to prolong engagement
  • Ability to restore purchases and continue progress
  • Improved UI scaling and readability on mobile
  • Expanded gameplay modes and story elements

In-app purchases

2 purchases

Evolvace E2

One-time2
  • Addition$0.99
  • Stage clear button$0.99
4 purchases

Ocean Keeper

One-time4
  • Full Game Unlock$2.99
  • Heap of meta currency$2.99
  • Chest of meta currency$4.99
Show 1 more
  • Crate of meta currency$9.99

Questions

Is Evolvace E2 free?
Evolvace E2 costs $4.99, and also offers in-app purchases.
Is Ocean Keeper free?
Ocean Keeper is free to download, with in-app purchases available.
Do Evolvace E2 or Ocean Keeper have ads?
Ocean Keeper shows ads; Evolvace E2 does not.
Which is updated more often, Evolvace E2 or Ocean Keeper?
Evolvace E2 ships an update every 8 months, and Ocean Keeper every 4 days. Most recently, Evolvace E2 was updated on October 24, 2026 and Ocean Keeper on October 23, 2026.

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