Hi,
Nice game. have to give many points to art style, as it looks very similar to what I make :). If you want to continue with this project, put your background on 1 or 2 extra layers and play around with parallax effect. This will give a big boost to how your game looks and will give it a nice 2D-3D look.
Please feel free to try out my game and rate it here: https://itch.io/jam/cgj/rate/474542
Many thanks,
Kris