The enemies eating the walls was nice, but no enemies ever spawned for me after the first ~16 seconds.
This game definitely could have used some cooldowns in the code. Instead of moving or shooting every frame that a key is held down, a timer could've been implemented so that it moves/shoots once, then won't move or shoot again until the timer runs out.
Also the download you provided is for Windows only, even though you marked it as for Windows, Max, and Linux.