The difficulty seems a bit out of tune. I didn't seem to have killed any enemy even after getting a dozen chests and ramming into them a bunch of times. Also you are kind of done for if you ever run out of charge next to an enemy, which makes the game really punishing, especially at the start.
It can be quite fun though once you're "in the flow" but with the game freezing for a looong time at the start of each run (I assume while the procedural generation does its thing) it's a bit frustrating.
I will say, for the simplicity of the assets and audio, it works quite well altogether giving the game a nice punchy and silly feel.