Blown away by the amount of original Skremplet designs in here, and they're all great. Loved all the optional content as well. You definitely made the most of this year's concept and of the ongoing Jam canon, which I love to see.
FYI, I did encounter some bugs:
There are two NPCs (Scrapper in Spoilheap and Bounty Hunter in Valence) who crash the game when I try to receive their Skremplets. I get the message "Script 'Interpreter' line 177: EventScriptError occurred. EventScriptError."
Also, when I picked up the mysterious shell in Spoilheap, it didn't appear in my inventory, so I wasn't able to get into the tower-looking place outside Valence.
Those small issues aside, though, I had a lot of fun. Nice work!