Really interesting concept. I actually saw a similar idea at Day of the Devs so I think you are on to something. The gameplay is fun but I do wish I moved a little bit faster as the mech. Love the idea of swapping back between ground and plane mode I think there is a lot to expand on for that. Using the blaster is satisfying and the plane controls were good for me (I just needed to turn up my mouse sensitivity to make it a bit more comfy). I think the advice you got for rings to be upgrades instead of ammo would make the gameplay even better for sure as you wouldn't be pulled from battle to reload as often.
Love the art style, and the screen effects. I think both added a nice amount of juice to the game.
Great Job Overall!