I'm not sure which part you're stuck on, but assuming my guess is correct, here's a hint. You need to break the lower chain of blocks in order to get the lower red key.
I really liked it. The dialogue of the people you meet along the way is very dark and atmospheric, and I like the whimsicalness of the mirror and the flying. Only by scrolling through the comments did I see that you were trans. The game was universal enough that I didn't see it as being specifically "about" gender, so props for that.
Only complaint I have is that the ending was way too long. After the player leaves the moon, I think jumping right to the woman on Earth would have really kept the game more tight and affecting.
Anyway, faved.
It isn't possible to fit through that tiny hole anyway. It's a puzzle more than a test of skill, so if one thing doesn't work, try something else. (Hint: you might benefit from replaying level 44 first.)
They only do something if you place them on already existing objects, and then only if they apply to that object. For example, colors only apply to keys and doors, and prices don't apply to walls. Don't worry, I'm planning to make it possible to color more things (including the character's hat).
oh man this game takes instinct, aim, forethought, rapid-fire fingers, and persistence. When you beat it you feel like a STAR! Speaking of which, you got five of 'em
 "The Valley Rule"){kind=icon}
 "Runotron"){kind=icon}
 "Rolby Super Hero Adventure"){kind=icon}
 "Power-up (prototype)"){kind=icon}
 "Super-Human"){kind=icon}
 "Personal Trip to the Moon"){kind=icon}
 "ASCIIvania"){kind=icon}
 "Comatose"){kind=icon}
 "StickMan Sam 10"){kind=icon}
 "Elevator Breakout"){kind=icon}
 "Nak the Crunkodile"){kind=icon}
 "Super Treadmill"){kind=icon}
 "Matrix Pandemonium"){kind=icon}
 "Last Xenos"){kind=icon}
 "Starcatz"){kind=icon}
 "Portal Snake"){kind=icon}
I'm not sure which part you're stuck on, but assuming my guess is correct, here's a hint. You need to break the lower chain of blocks in order to get the lower red key.