I like the environment and the enemies, and I'm always amazed when people are able to come up with 3D games for game jams.
Some feedback: I accidentally closed the browser window by going forward and shooting (ctrl + W) - But I think that's on me haha, everything worked well when I used WASD +Space. It'd be nice if I could continuously fire by holding space. I liked the concept of getting lives by shooting enemies, it can be a great way to incentivize agressive playing.
Congratulations on finishing an entry on your first game jam! Good job!