Rat Killer Robot Invasion vs Bullet Engineer
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Rat Killer Robot Invasion
Embark on an epic quest to exterminate waves of invading rats with futuristic weapons. Collect in-game currency to unlock new zones, upgrade your robot companion, and customize its appearance. Explore diverse worlds and face challenging puzzles and boss battles.
- Rat extermination action
- Robot customization
- Weapon collection and upgrades
- Diverse world exploration
- Puzzles and boss battles
- Collect money and gems
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Rat Killer Robot Invasion: Save the World! The world is under siege by a relentless rat army! It's up to you, the ultimate Rat Killer Robot, to restore peace and cleanliness. Are you up for the challenge? Rat-Blasting Action: Armed with powerful weapons, embark on an epic quest to exterminate the rat invaders. Zap, blast, and splat your way through waves of rats to protect the world! Collect & Upgrade: While on your rat-slaying adventure, gather valuable money and glittering gems. Use them to unlock new zones, buy futuristic weapons, and upgrade your trusty robot companion. Customize your robot with cool, eye-catching designs. Explore Diverse Worlds: Travel through various zones, each with unique challenges and rat foes. From city streets to hidden sewers, the battle against the rat invasion rages on! Game Features: - Non-stop rat extermination action! - Endless customization options for your robot. - A plethora of weapons to choose from. - Exciting puzzles and epic boss battles. - Explore different zones and unlock secrets. - Collect money, gems, and robot parts. - Free to play! Join the Rat Killer Robot Invasion and be the hero the world desperately needs
Bullet Engineer
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Bullet Engineer is a fast-paced pixel-art roguelike shooter where every run unlocks new weapons, shells, upgrades, trophies, and prestige ranks. Fight endless waves of enemies, complete missions, master powerful shell types, and climb through the prestige system to become the ultimate Bullet Engineer. Features: • Fast arcade gameplay • Unique shell upgrades • Prestige progression • Daily missions • Weekly challenges • Unlockable trophies • Pixel cyberpunk visuals • Offline gameplay
Screenshots
Verdict
The clearest difference is in-app purchases: Bullet Engineer at none against Rat Killer Robot Invasion's 17. Rat Killer Robot Invasion's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 18.6). On price, update cadence and ads 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
Both are free to download. Rat Killer Robot Invasion sells 17 in-app purchases, starting at $4.99 per 7 days. Bullet Engineer asks for nothing beyond the download.
Rat Killer Robot Invasion ships an update every 10 days, Bullet Engineer weekly. The most recent releases landed on October 22, 2026 and October 12, 2026 respectively.
| Parameter | Rat Killer Robot Invasion | Bullet Engineer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (2K ratings) — better | — |
| Positive reviews | 31.1% of reviews | — |
| Number of ratings | 2K — better | — |
| Update frequency | Every 10 days | Weekly — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 353 MB | 11 MB |
| Age rating | 9+ | 4+ |
| Developer | TapNation | Ibrahim Al-Dossrai |
Bugs and requests
Rat Killer Robot Invasion
Reported bugs
8 issues- Character flipping upside down or flying across the board
- NPCs getting stuck in portals or on walls
- Incorrect item/reward drops from chests
- Launching player off the screen
- Robot unable to keep legs on the ground and rolling around
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- Collector robot not depositing cash
- Portal progression not working as intended
- Crashes on launch
Requested features
4 requests- Optimize performance and fix bugs
- Improve game balance and progression
- Add more content and features
- Provide better customer support
Bullet Engineer
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Rat Killer Robot Invasion
- VIP Membership - Weekly$4.997 Days
- Elite Membership - Weekly$8.997 Days
- Elite Membership - Monthly$24.991 Month
- Skip It - Small Pack$0.99
- One Time Offer$1.99
- Handful Of Crystals$1.99
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- Bunch Of Crystals$4.99
- Skip It - Medium Pack$8.99
- Pile Of Crystals$8.99
- Rats Pass$9.99
- Small Bundle$11.99
- Master Mode$15.99
- Starter Pack$15.99
- Medium Bundle$24.99
- Limited Offer Pack$29.99
- Premium Offer$39.99
- Crate Of Crystals$89.99
Bullet Engineer
No in-app purchases
Questions
Is Rat Killer Robot Invasion free?
Is Bullet Engineer free?
Do Rat Killer Robot Invasion or Bullet Engineer have ads?
Which is updated more often, Rat Killer Robot Invasion or Bullet Engineer?
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