The rewind mechanic in this game is underwhelming due to it lasting for only about 2 seconds and taking a long time to obtain, and you may even be killed for using it if you happen to rewind where the enemies previously were spawned. However, I did appreciate how chaotic the game became at the later waves. Personally, I would add items that spawn randomly around the arena that give the player boosts or extra powers, it would definitely make this game even more enjoyable to play.