Arenas, dungeons, rooms, a huge amount of monsters and bosses. Roguelike + first-person autoshooter. Unique weapons, various modifiers for the character. All this is waiting for you in Survivter.
Estimates — owners use the Boxleiter method (reviews × 32), wishlists proxy followers × 12, revenue uses ~62% of list price × est. owners. These are rough industry heuristics, not official data.