Similar to AK_Monkey's comment, I wasn't able to play again on restart, and I wasn't sure what the costs of the upgrades were, so I don't think I could buy anything. The concept works with the theme, though I think you could explore this idea in more detail; maybe there are points of interest on the map that you can go to so you can recharge fuel or something. Just some thoughts, good job on submitting!

Neat - making a game is hard - good job

Nice game, but game freezes on restart.

few suggestion:

Improve controls, plane currently doesn't feels like a plane or maybe change plane model to a Tank model.

need some sound,

reduce bullet speed, its impossible to dodge.

Cool concept! If you continue developing it after the jam, let us know!