Nice game!
Some feedback notes:
- The button choice is a bit weird, like other comment stated.
- It would be better if you added a tutorial, or some platforms that don't change by pressing SHIFT, so the player can understand how the game works instead of having to read the description.
- Some platforms are way too separated from each other, so it's hard to succeed in the jumps.
- I completed the last level by accident, because I feel from a platform and luckily fell into the door. I think these kind of design may confuse some people.