Well done! It takes a simple looking concept and iterates on it surprisingly meaningfully. I enjoyed seeing new mechanics/obstacles pop in that kept things fresh as the game progressed. And the difficulty progressed naturally as these mechanics started to overlap with each other. There was quite a good variety of challenges with the tools and obstacles that were given and they felt very explored. It feels like a complete package that uses everything that it presents well.
Now, I also got confused a bit in the tutorial with the double jumps. But everyone else already mentioned that.
I didn't even know there was a secret level until I looked down into these comments so that's actually really cool.