Congrats on the first game jam!
The idea for a game was cool, but I think a bit ambitious for a 4 day jam. I believe it's better to deliver smaller polished game than a bigger one that needs more work. In case of your I think all the elements need it. The camera is positioned in a way that makes it difficult to see, there's no sound (check freesound.org for sfx and mobygratis for free music). The gameplay is pretty slow.
Don't get discouraged- time management is maybe the most difficult part of software development. Try again, get better, keep it up.