This is cool, but I think it's necessary to indicate the controls, particulary the Z, to interact. I also would liked to have checkpoint, but since you were in lack of time, it's not important. The graphics are cool, and the music is coherent with it. Good job!
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And the lack of checkpoints is a design decision that will make more sense when you have battles there. The monsters will respawn if you die, but you won't lose experience. So you get better at doing the puzzles, and get better at doing the battles the more you struggle at it. And the real challenge comes to do it without death. But this level which will be the tutorial, is the longest I'd go without a check point, for sure. The ability to try again and be better at it is cool and all, but climbing a mountain twice is ridiculous.
Thanks for playing!