Thank you so much for the indepth feedback Gatlink, I really appreciate you taking the time to write that out, a lot of great points!
The lack of momentum once you hit a wall has been one of the biggest frustration points with the game and I 100% agree, I ran out of time to add back some momentum, but that is the first thing I'll introduce if I continue working on the game! And yup... there is some weird physic bugs happening where at times your bird will flip when hitting the wall - I'm not entirely sure where that bug is just yet, but it would be on the list to fix!
And great point on the checkpoint system (or lack there-of haha). I was inspired by the game HopShot where if the player misses the jump, they just fall back down, and may even fall all the way to the beginning of the game... I wanted to soften that experience with start of level checkpoints, but if I continue working on this, I want to make that system way more intuitive and introduce mechanics where the player can also zip around sections easier.
Thanks again for the great feedback, and no worries about not finishing the game, I appreciate you giving it a good try!