I don't know if this would qualify as a boss so I'm just going to put it here
(Sorry it's not high quality, I made this before all the others)
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Boss? Idea 6 - Squirm Worm
Pretty standard boss honestly.
When you defeat it, it'll drop slime that you can take to your workbench.
But if you lose to it, you'll activate a CG with it and get a game over.
(Something akin to this)
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Okay, now I'm done!