This is super cute!! I like the spin on the “You get only one [time unit here]”, it’s clever.
I thought one thing that was missing is some time limit to make it through the dungeon. Right now it’s all self-imposed, and I noticed the game got more fun when I tried to do a level in a time limit I would put on myself. I think without some extra limitations it feels a bit too much like it is just a regular platformer.
Also, control scheme! It might be just me, but when you switch from horizontal to vertical I was expecting “left-right” to still work, it took a while to get used to having to switch to up-down.