Thanks for playing and great feedback!
I tried my best to design puzzles in a way that you can get the main idea, or at least see the main obstacles you are facing with, with looking at the level geometry, or just playing out with the level. But unfortunately most of them need some sokoban maneuvering even after getting the idea.
Ooops! I didn't notice the ESC problem, sorry! I will see if I can sort it out.
I see how a playthrough video could help, I hope I can find some time for that. Adding visuals for tutorial is a great idea, gonna do that asap.
Highlighting when a change is possible sounds like a nice idea, but I don't know if it would ruin some surprises and eureka moments in later sections. But I will try to improve visual feedback in some way.
Thanks again for the feedback, it is really useful!