Survival Shelter by FATTOY presents a colorful twist on the tower defense genre, positioning itself in the crowded mobile gaming market through its chibi aesthetic and character-merging mechanics. The game tasks players with assembling teams of anime-style heroes to combat endless waves of zombies across urban environments, offering a more approachable alternative to complex strategy games while maintaining tactical depth through unit combinations and upgrade systems. The core gameplay revolves around two primary mechanics: character merging and wave-based defense. Players strategically combine identical units to create more powerful versions, with each hero possessing unique attack patterns ranging from area-of-effect explosions to rapid-fire assaults. The progression system unlocks new characters through gameplay, while the equipment and skill trees allow for further customization. The 100+ level structure provides structured challenges, complemented by endless modes for players seeking continuous engagement. User interface design employs intuitive drag-and-drop controls for unit management during combat phases, with clear visual indicators for merge opportunities and enemy paths. The chibi art style maintains consistency throughout menus and gameplay, though some visual effects during combat could benefit from more polish according to user feedback. Real-world usage patterns suggest sessions typically last 5-15 minutes, fitting well within mobile gaming habits while providing meaningful progression through each play session. User reviews consistently praise the game's satisfying combat mechanics and character progression system. yuur (2025-08-27) notes the satisfaction of 'watching how your team destroy the enemy' while suggesting visual improvements. Multiple reviewers including Israel (2025-09-01) request additional unit variety, indicating engagement with the core collection mechanics. Technical issues surface in some feedback, with Jason Nathanael (2025-09-02) reporting startup problems and Hanif Hanzhalah (2025-09-03) criticizing the repetitive login requirements. The game demonstrates strengths in accessible strategy gameplay and satisfying progression systems, though limitations appear in technical stability and content depth. The merging mechanics provide genuine tactical decisions without overwhelming complexity, making it suitable for players seeking light strategy elements. However, the current implementation would benefit from expanded unit variety and more reliable performance across devices. Ideal for casual gamers interested in tower defense variants with collection elements, though hardcore strategy enthusiasts may find depth limitations over extended play.