I started a bit late with this Jam, but I least I got something working. My game is an "All against one, how long can you last? type of game." Here is what I got done:

1. Player movement, 
2. Player main attack,
3. Enemy targeting player, 
4. Some sound effects and some placeholder music.

What I still need to do:

1. Make the background
2. Add more enemy types
3. Adjust enemy spawn rates.
4. Some other stuff that I can't think of at the moment.

Anyway, as of writing this post, it's just about midnight. I'll leave you with a screenshot of my game so far.