Great execution on the Game Jam theme! I especially love you have have to walk through the entirety of the first room before you can shrink down. It really changes how you look at certain items - at first the stacks of books seem like useless rubbish because you can't interact with them, but later it turns out they were a critical platform!
I kind of wish the whole game stuck to the puzzle-y theme though - the combat with the gun and the turrets didn't really seem to fit. I can understand wanting to find some way to motivate the player to solve puzzles quickly though - it might have been better to leave out the gun, keep in the turrets, and really emphasize that getting small is your only way out of that situation.