Played in sandbox, just to be safe.
-First level is funny, since you expect being able to eat the dots, I ate the same dot a couple times before realizing nothing was happening. 2nd level then cements the goal, to put things together.
-I like being able to change the snake head direction, acts like an undo if you eat something. And, it allows you to do the actions faster.
-Not a big fan of the portal opening the instant the last tile is in place, since your snake butt is still in front of it. Wait till after the snake move away from the piece to solve the level, I think.
-Rotating bone is a fine puzzle idea, but it feels kind of cheap since there's no reason for it to do that, and we already did a bone puzzle with no such rotation. At the end of this puzzle, I think I failed to realize the actual gimmick, where it's being mirrored depending on the snake head direction maybe? Because I had a config where both bones were snapped side down while next to eachother, then did a snake head reversal twice then it was the right shape and ended the level.
-So we get an expansion on the skull level too. idk, the new gimmick makes the level longer, but not more interesting. But overall, I'm not entirely sure that's the direction to take the puzzles. I'm sure you have plenty of ideas though, if you expand on this.
Cool game.