Very nice! In addition to what folks have said below, it feels very GameBoy due to the palette and I absolutely love that - it's all-around got a lot of positive qualities, and to have pulled off so many features in such a short period of time shows true dedication!
The only thing I'd suggest for the future is to include WASD for arrow inputs as well, as many keyboards these days do not have the arrows at all, or have them in weird spots (mine are in four keys across both hands, it's so dumb, but I have to use it for ergonomic usage). But yeah, overall the game felt very great!