1) Adjust the sound volume. It could hurt headphone/earphone users.
2) Add a health indicator next time
3) Add some light related stuff since that's the theme
4) The attack mechanism is not consistent. I get 2 balls then I lose 1 when I attack (I don't know if that's your design)
5) Camera should be top view (Just my opinion lolz)
I find it fun overall but you could've added some checkpoint d*mn it. I was having fun until I started all over again XD