I'm really sorry, but I wasn't able to figure out how to progress. I was stuck on the key side, because I couldn't jump. And I was stuck on the lock side, because I couldn't jump high enough :( . The art and music was pretty good tho.

Unfortunate that you couldn't get it done in time. As you said in the game description, there's pretty much nothing for one side to do.

Was enjoying the platforming of the lock character until I fell into a checkpoint that kept respawning into enemies in a death loop (just above the platform with two slimes going back and forth). As such I didn't get to see what happens when the two sides finally do get together :P