Thank you for your insight mate, I agree with the points, I will tweak the on-ground and in-air speed a bit to make the player seem a little more in control. I also feel like I will let the spamming button part stay as you said it feels rewarding when you discover it and you can't highly benefit in most levels using it. I would love you to elaborate on the different game mode part as I've been working on a 'Hard' mode and would be open to adding different game modes and such.
I greatly appreciate you taking the time to play through it and writing your comment.
This partly goes back to the part where the logical framerate feels too low. Falling feels instantaneous and you have very little time to react (and I don’t think it’s my reaction time either, though it was late yesterday).
My suggestion is to add the option of lowering gravitational force, especially if you won’t be increasing the logical framerate.