I'd recommend adding some information on the controls! For jams, it doesn't need to be in the game, it can be in the page's description if necessary. I think there's the arrow keys, but also the space bar seems to control the enemy? I found that a bit confusing.
Each art asset is quite nice on its own, but put together I feel like they clash a bit, though, to be honest this is something that I struggle with myself and I imagine it's even harder when there's more people.