You've interpreted the theme in a very literal sense, as many others have, but that's okay! I think the gameplay is alright, but it is definitely a little janky in some places.
I had a difficult time understanding the puzzle with the door that closes when the arrow hits the wall, but I somehow got past it and then accidentally got sent back to it when I touched a flag on the next level.
Visuals are simple, but clear enough.
Maybe polish this one some more and you could have something pretty fun and solid!