The Halloween update also includes other secret transformations using similar methods:
If you are looking for other secret unlocks while getting Mal0, try these: how to get malo in lovely craft piston trap verified
I can provide more specific instructions once I know exactly where you're getting stuck! how to get malo in lovely craft piston trap verified
Since this appears to be a specific guide for a potentially niche or user-created game mode, here is a structured "Paper" outlining the strategy for verification and success. how to get malo in lovely craft piston trap verified
is part of the "Halloween Dark Ritual" added in the 0.2.999 update Carved Pumpkin