I had a lot of fun playing this one! My only piece of feedback is one of the last puzzles relies on you remembering that "B" ejects you downward from the coffin, which no other puzzle seemed to use.
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You have a good point! I tried to design the levels in a way that lets the player learn the mechanics without explicitly telling them, though sometimes I could add a couple of hints. On the other hand, I was aiming for that 'big brain' moment when you realize you can use B instead of A, just like you did!
Thank you for playing—I really appreciate it!