Good concept! It has a lot of potential but some things should be adjusted:
- It would be nice if the camera moved slightly in the direction of the mouse cursor (to make aiming easier)
- Enemies shake too much. I am not sure if this is intended, but it doesn't feel right to me
- All the features that you listed on your page (especially the sounds and music) are must have, but I understand that usually it is hard to do everything during the jam
Overall, great job!