Yeah impact feedback is really lacking as is right now, can't argue with that :p
The navigation issue i can underestand as well since i didn't really manage to make it obvious, but ships don't have a full sprite hitbox, that's why for instance even the biggest of the 3 should fit through even tight patterns (did it like this since older shmups sometimes had this rule of a smaller hitbox than it would seem) but i admit i failed to convey it properly, not helping that while small, all 3 ship still have a different one ^^'
Shields through powerup to have them be a bit more traditional seems like an interesting fix, if i have the time to work for a post jam version maybe i'll try it, though originally i wanted to have some self charging shields a bit like what's in Tyrian2000, cause i thought it would be interesting to have that margin for error and that as long as you have shields you don't take permanent damage to your actual hp bar. but hey that's jams, i wanted to try something XD
Bosses issues like i said totally agree that the level drags on way too much and due to issues i couldn't really make a better system in time, also agree that i should try and find a way to spice up the spawning a bit cause here thay just spawn from fixed positions so it can be quite repetitive :/
Anyway, thanks for playing and for your detailed feedback, and i hope you still enjoyed the game despite its many flaws :)