Generally I hate the "pick pellets up" "genre", but this really did it for me. The huge keys were kind of annoying... but the doors were always close enough that it was funny too.
Good use of silence+music, and the ending was a great way to cap it off. Totally didn't see it coming.
About the 1 pixel hitboxes. mentioned by others.. mostly fine since it was so limited and you could always get a hint. Could have been better though if there was a way to slowly move (combined with other reasons to use it, so the added complication would be worth it).
I was really baffled by the skip text button design though... It really should have just skipped the whole line rather than just loading it all immediately. X X X is much nicer then X Z X Z X Z. Kind of related but not really, I ended up missing some text permanently because there's no way to read some text if you clicked past it. A bit beyond the scope of the game, but if this were to be fleshed out / remade, a log of previous lines would be nice.
PS: Got here on Digibro's recommendation