I really enjoyed it, really fun! I loved the aethetic and the lights were so satisfying (the rays under the fences are my favourite). The big ennemies creeped me out I was not expecting them to be this big XD
I think it would definitely need a background music. If you plan to work on the game to improve it later I will advise you to add different types of enemies (with projectiles or flying ennemies) and maybe collectibles like different weapons and powerups :)
Anyway those are just ideas because this game is neat and would deserve a future! really good job