really simple game. has potential, but pretty bare atm... some polish would help with this, like adding particle effects and slight camera panning or shakes.
for the art, its fine... but simple ways to improve it is by having a uniform pixel size, so no mixels. also using a limited color palette helps a lot with the games visuals... try using 4 to 6 colors only next time as this would help a lot in improving your art.
feel free to check out my games as all of my solo projects use a limited color palette: https://macrowdev.itch.io