I will cover scoring more clearly when I work on an update after the jam.
But matches can only be made along the faces horizontally or vertically (not diagonal) and when 3 or more face colors match along that direction and at the same depth~ and only when the face is exposed outward without another cube blocking that face. If you can't see the face outward then it won't be considered for scoring. I haven't encountered any issues yet with rotating some of the cubes.
Are you able to tell me anything else related to the cube not being able to rotate. Is the scale of the cube the same, has the color of the it changed when it is unable to rotate (other than turning gray for it having been locked)? A cube should only ever be able to rotate if it is your active cube. And there can only ever be 1 active cube at any given time. So if you are running into an issue like this and Cube has not been locked yet, any information you could provide would be greatly appreciated, Thanks for the feedback! Thanks for playing!! :)
Ohhh!! You made me think actually, which I should also clarify in the game rules and in general, A cube cannot rotate if it has been pinned. A cube is considered pinned vertically or horizontally from the rotation direction you try to make, when it is sandwiched between two cubes vertically and or horizontally in that attempted direction~ which in this case, the cube should flicker red to indicate a blocked input.
Hopefully that was what you you were experiencing!!