Hey, Corridor is pretty clever!
I like how you kept it simple in regard to game components and focused on designing levels that properly taught the concepts and progressed smoothly. The undo button was also a pretty clever addition for when you made a little mistake, as well as the "retry" in the pause menu, for when you massively screwed up.
I really enjoyed playing the levels "Deadlock" and ¨Twin tale". Made me think a lot and were really cleverly designed!
Thanks for sharing! Rated!