Nice simple game! As the other comments stated, many of us are fairly new to game jams too (this was my 2nd one too)! Obviously, some polish to remove the various little bugs, improve the UI, and add sound would be a good thing, but it's understandable given that you didn't have that much time. The one thing I do think would help gameplay though is to add more attacks, as it's a bit annoying that the enemies can move freely, spawn anywhere, and shoot at you, but your only method of killing them is to run right at them and get in range of their weapons.