With the cover image I thought the twist would be a bit more dimension-based, not so much block shape as in the canvas maybe rotates, or slants sideways, something like that... maybe promises a bit more than this delivers but still a fun thing! Seems some blocks do disrupt things a bit though, they don't seem to sync like they're supposed to, for example: https://www.newgrounds.com/dump/item/2de8f87b2c4dd18b49230a3672c9a2b5
...seems to happen with more than one of the 'new' blocks, and it doesn't seem like this would be intentional? Seems a bit buggy but: potential!
When you figure it all out it'd be fun with a real highscore table too, open up for competition a bit, just sayin'. ;) Keep it up!
-cd-