Honestly, Ig a tutorial could do some good to some ppl
But for me atleast, the mechanics were self explanatory.
I really liked the art and the puzzles! Though the movement felt aa bit unresponsive.
The gradual speed up is a good thing mostly but it speeds up too much and it becomes impossible to control while moving in such small spaces
Regarding the crystals, I would also like to add that jumping and interacting with them with the same button is either not the best idea or a genius one
Like its understandable and wasnt annoying, but felt kinda weird.
And ofc I didnt make the game so Idk if u tried other key bindsfor interacting. I guess that you did and it was hard to jump and press another button to interact in time
But still, Id say Id prefer to have different key binds for jump and interacting
Other than that, this is a pretty solid game, the art, the sound were all top notch!
You really did an amazing job fitting all that in 3 days :D