Very literal concept, and it fits the theme perfectly! At times, some of the later levels made me feel overwhelmed, but solving them was definitely satisfying. Oops, looks like I posted twice. Apologies!
Thanks for your feedback! Yep, creating the levels was one of the last things I did, so near the end if I made a level that I *could* solve, I put it in. If I could, I would remake a bunch of levels to be tricky, but only have like maybe max 4 keys on the screen to pick up.