very interesting. i like the approach of evolving costing lives.
but i too think that the balance is rather off, throwing to many gameplay parameters around that would require to fundamentally change the game environment.
- with the glider i find my best bet to not move at all while i can, while dodging a straight down bullet with the zeppelin is almost impossible.
- the first plane i can oddly run into the screen border or circle numbly to avoid bullets in a handlable way.
- the second plane is finally making proper use of the enemy and camera behaviours, even making the level kinda simple, which was of course necessary for it to be somewhat playable with those other control schemes.
hope you don't mind my elaborate feedback, just trying to point out what i think this quite bold design choice entails. great effort and brave take all in all!