A solid tower defense game. As you go up, it forces you to think hard to win the level. As powerful as gacha units can be, low rarity units will also play a huge from early to endgame, which means this game isn't all about powercreep. Grind is a pain since the energy bar (sanity) refills slow. Do not worry about gacha since the game will reward you with 5200-5700+ free gacha currency/week, with 10x gacha costs 6k GC + Guaranteed 5* operators + Pity system. Like c'mon, very generous devs with amazing game content and updates. The base good base costumization will help you relax and sometimes interact a bit with your operators, and you can craft important power up materials via base. For me this game is an excellent PvE based game.