I think there should have been more focus on the jump controls, I have no idea if it was a byproduct of adding forces or a design decision but the double jump seems like its dependent on 'thrust' so you go much higher if you quickly double press than you go trying to time it for the top of your jump. I also did the second jump of the tutorial level first time and now I just can't seem to clear the distance anymore.
The tutorials 'send back to start' mechanic is brutal, especially when you purposely make the player fall in when introducing the rewind mechanic. A bug I found is if you exit the game then go back in (I promise I didn't RQ :P) and try to avoid falling in the first time by using Q, the dialogue popup bugs you out and makes the rewind mechanic mess up before you can reach the collectable, at least it did for me.
Sorry if I seem negative, I just couldn't experience much of the game because of the above. I just kept dying and getting sent back to the start and I got frustrated seeing that I was making no progress.