Nice! Slide and wall jump mechanics feel good to me. I actually beat this, though I died about thirty times. The theme of it was cute, and the puzzles simple yet challenging. Ran smooth and that's really important. I can tell a lot of fine tuning went on under the hood.
If I had to make any critique for the future, it's that the hurtboxes for the spikes in particular extend out slightly further than I was anticipating they would, leading to deaths that feel a little less fair - I'm thinking of the alternating spike/wall jump tunnel about midway through the game. I had to slow way down to avoid getting killed between the latter two, where it looked like I could clear it no problem.
I hope it's okay, I don't normally like to leave critique, that's just my two cents.
Thanks for making this game!