Fantastic game! I also got a bit stuck on the Untitled section, but it was a great moment when I did eventually figure it out.
For any future players, potential spoiler below:
This may have already been considered, but I feel like the solution would have been a bit more intuitive if the obvious path to the exit (the one with the gate) was actually completely missing (just a blank wall); this way, it's obvious that you're not searching for a key, you're searching for a neat way to get there instead. It might also expand upon the "unfinished" theme in that level, like "oops I forgot to place the exit". But I suppose the current level design works with the idea of "oops I forgot to place the key", so either way, it works!
Otherwise, honestly a great experience beginning to end, I loved figuring out how the maps work naturally, I loved the little spooky moments, and I echo that the bicycle was a fantastic quality-of-life addition. Really impressive work for a game jam! Would love to see what you come up with next!