Cool! I like the idea of adding the pause time after Shift, which turns it from a pure strategy game into a action + strategy mix of game!
One thing though: putting a fake door in level 1 feels a bit much for me, especially since it’s a stylized door and doesn’t read like a “normal” door. On my first few runs, when I reached it (and didn’t even realize it was the door yet), it just disappeared and I had no idea where to go. I actually thought it was like other type of platformers where you need to go left to reach the next level, but I keep dying with that, then after a few runs, the door showed up again after I touched it after waited a moment and I finally understood, Personally suggest that at least don't use it in first level!!
Anyway, the concept it's really cool! Great Work!