I've never played this game before but to me it just looks like INK. That's pretty much what everyone else says online, so can you guys just tell me, is this a different game? Do you have a reason for speedrunning this instead of INK?

This is veeeery like ink but different levels. Main difference: this is available on mobile.

Overpainted is a rip-off of INK. Main diferences are that Overpainted is available for mobile and has some interesting glitches