The game is super fun and satisfying to play. It's missing audio cues for when there are enemies behind me. The floor mechanic is fun and unique, switching quickly to the terraform to build a platform underneath myself was really cool. Right now the game gets stale a few minutes in, so adding a few different enemy types aside from the basic player-seeking eye, like maybe one enemy type could start tearing up the floor, would help a lot to make the game more varied. I like that the game starts with a different wave each time. It helps make the game less tiresome to restart (Which happens a lot). Some more things I would like to see in this game: 1. A secondary attack for your primary weapon would help when there are large swrams of enemies, like when you can tap the fire button to do a shotgun attack in Devil Daggers (which you're probably aware of), for example. 2. Maybe a limit to how much terraforming power you can obtain, or it could be depleting slowly even when unused, so the player has to use it instead of just hoarding a lot of it at the start. 3. The floor could break faster the longer you survive to add difficulty later in the game, if it doesn't already.
Overall its very fun and would make a great finished game imo