I noted you have inspiration from Sebastian Lague's video for the environment.
Not sure if it was my pc but your game doesn't have sound as of yet. I would really suggest you add it. I also made my first ever game in a game jam and sound was one of the things I wish I had added sooner to my game.
I think maybe implementing some shooting practice and differente types of ammo would be cool.
Just spawn some rocket translating in a Vector3.forward from the bottom of each wing. Add some colliders and explosion and you're set.
To keep in the theme of holes, might I suggest using or quickly making a low-poly air baloon that you have to shoot down
