I played with keyboard. The controls are really really rough, and the level design is brutally unforgiving. It took me 6 hours to complete the whole thing due to the high difficulty. I only managed it thanks to finding what I am pretty sure is an exploit too. Luckily, I have played enough Celeste to understand the basics.
I love the story you have going here, and the art is really nice to look at. Both the CG and the sprites. Though having to scroll to the comments to know how to play the next level is a bit rough. ( I suggest adding it to the description of the game controls. )