I agree with Mr. Dr. Bean having audio would have been massive for this game, audio can cause a massive change for a game. The boss fight you could sit at the very bottom and only have to worry about the guy going back and forth in the middle. Fights against bots were easy once you got the hang of how they worked staying horizontally on them at the bottom keeps you out of harms way. Also when destroying the tubes you could hide behind them to not die from other enemies. This is a secret favorite of mine. 

I think this was a pretty nice game to play through, the art is nice and simple, and the game follows the theme quite well. However, the enemies feel a little tank-y sometimes, making everything slog a little bit, and because most enemies don't have attack indicators (that I noticed), I took a lot of damage that was a little unfair.

Still, despite these issues, the experience overall was charming and nice, has the potential to become a nice title :)

Enemy variety is good, and the base mechanics all work well. Combat is a bit slow and repetitive, but it serves the overall gameplay loop well enough. Audio would be nice, but even the current experience is impressive for a solo dev!