RobotVSAlien vs Otter Forest ～Idle Game～
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
RobotVSAlien
Defend against alien invaders using a growing army of robots. This casual defense game allows players to upgrade and promote their units to increase their strength. Design your own giant robot and repel the alien threat.
- Casual defense gameplay
- Unit promotion and upgrading
- Design giant robots
- Repel alien invaders
- Unique robot and alien designs
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" Robot VS Alien " is play to easy Defense is a game . In friendly units up to eight simple We will continue to increase and promote the game . It appeared suddenly and making full use of robots Let's repel the alien ! ·Characteristic - Easy to play casual defense game Share and design your own giant robot ! Of - unique design robots and aliens corps
Otter Forest ～Idle Game～
Collect adorable and unique otters in this idle game. Improve the forest environment to attract more animals and complete your picture book. Interact with the otters to uncover their stories and enjoy healing gameplay during your free time.
- Collect unique otters
- Improve forest environment
- Complete picture book
- Interact with otters for stories
- Idle gameplay
- Easy operation and simple rules
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“Otter Forest” is an Idle game where a lot of cute and unique otters gather. After setting the meal, take a peek into the forest at the spare time. A lot of unique otters are gathered. By improving the forest environment, you can collect more otters and animals. All kids are cute so watch them all and complete the picture book! The more you interact with the otter, the more information you can get. Contact each other so you can see all the stories of a unique otter! - A lot of unique otters that are cute and have a slight habit come out In the otter forest Fat child, child who seems to have bangs set It seems that there is such an otter. A lot of unique otters come. - Enrich the otter forest and collect lots of animals! By preparing the environment such as forest nuts and playground Various otters will gather. Let's put all the otters in the picture book! - Touch the gap time! Otter Forest is a neglected game is After setting food, just wait Let's see the situation after a while Various animals are gathering! Let's be healed in the gap time! - Get along with the otter! Get in touch with otters and get closer Otter information increased by making friends with the otter. The picture book will be enriched! You can see various otter stories! Some animals gather by getting along with the otter. More animals will gather! - Easy operation and simple rules “Kawaso no Mori” is a simple operation that touches the tablet. Even people unfamiliar with the game can play. Since it is a simple rule to touch otters gathered with food, I think that you will understand immediately. Since the tutorial can be reconfirmed from the options If you get lost, you can always check
Screenshots
Verdict
The clearest difference is rating: RobotVSAlien at 4.0 against Otter Forest ～Idle Game～'s 1.5. RobotVSAlien also leads on update cadence (every 2 weeks vs every 6 months) and iOS requirement (7.0 vs 11.0). Otter Forest ～Idle Game～'s advantage is in-app purchases (none vs 1). On price, ratings volume, 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
Both are free to download. RobotVSAlien sells 1 one-off in-app purchase. Otter Forest ～Idle Game～ asks for nothing beyond the download.
RobotVSAlien holds the better App Store score, 4.0 against 1.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
RobotVSAlien ships an update every 2 weeks, Otter Forest ～Idle Game～ every 6 months. The most recent releases landed on October 21, 2026 and October 5, 2026 respectively.
| Parameter | RobotVSAlien | Otter Forest ～Idle Game～ |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | 1.5 (2 ratings) |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 2 weeks — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 55 MB | 58 MB |
| Age rating | 12+ | 4+ |
| Developer | Akihiro Fujiwara | minoru yamazaki |
Customer experience
RobotVSAlien
Otter Forest ～Idle Game～
In-app purchases
RobotVSAlien
- Remove Ads and Privilege granting$0.99
Otter Forest ～Idle Game～
No in-app purchases
Questions
Is RobotVSAlien free?
Is Otter Forest ～Idle Game～ free?
Which has better reviews, RobotVSAlien or Otter Forest ～Idle Game～?
Do RobotVSAlien or Otter Forest ～Idle Game～ have ads?
Which is updated more often, RobotVSAlien or Otter Forest ～Idle Game～?
Other comparisons
