I will most definitely add some features that I didn't have time to add to my game.
This was the first time I participated in a jam as a married, full-time web developer, so it was hard for me to manage my time and schedule.
What I would add is:
- Musik & SFX
- Point system
- Ending
- Slowmotion when you die (making it obvious that you change to the killer)
- Camera shake
- Particle effects/explosions
- Different types of ships/weapons
- Pick-up items (maybe for changing/upgrading ships/weapons)
I would guess there's a lot more I could add to polish up the game, but these are some of the things I myself did try to add within the time limit or stuff I have gotten some feedback about :)