This game is absolutely incredible! I really enjoyed it. I've actually got a good bit of feedback I'd like to offer.
Having the transitions sped up a bit would be nice; I spent a lot of time just waiting between deaths, which for a speedrun type game, isn't the best, and feels clunky.
I'd love to see the effects of the momentum a bit stronger, so you're really encouraged to swoop and gain/maintain momentum.
Having mouse control would be a lot of fun and would feel really satisfying, and for keyboard controls, I'd like of like to see an option to invert them; W for pitch forward and S for pitch back feels more intuitive to me, personally.
The leaderboard didn't seem to work for me? Not sure.
Overall, absolute banger of a game! Visual style was really unique and consistent, the whole mail theme for everything was really cool, I really liked how the name for the score submission was a "sign here" form, really cute!
The music goes hard AF, doesn't get tiring on the ears, love the sound design, overall, this is an absolute 10/10 game! Would really love to see this get expanded after the jam, it's a lot of fun to play!