I think it could use some more work. Only the first grey cube actually fired back. The game could use a health system and hud, and definetely some more polish.
No worries, just spend a little time polishing the game after the jam. If you don't know how to do something ask around on forums or search up youtube videos. I recommend watching some Brackey's Tutorials which can help with a lot of specific features especially things like Health Bars, Menus, etc.