This one goes hard, please don't ever tone down the explosions and effects.
I feel like it could be a very cool game if I was fighting endless hordes of chickens.
I get that it's not the final product, and as such it looks empty, but since it's not a usual idea I think you could also go crazy with what to do with the scenery, I don't even feel like it needs to be complex, the simplicity is nice.
Oh yeah also maybe disable bullet collisions for the player?