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Better English on the instructions would be nice but not a big issue, a single play shows how it works.
Very much needs a timer for two reasons. First, in multiplayer one person could stall forever. Second, the game is solvable before the first move if you stare at it long enough. (Takes me a long time; others may be able to do so instantly.)
For multiplayer making points gained/lost partially tied to time taken to make a play would fix both issues. Single player as a solveable puzzle it's fine.
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Add timer. People will stay AFK inside the game. Also, it's nice to know if you are LEFT or RIGHT. Other than that, 5/5 cuz I cannot make such a game.
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I remember a game much like this on the Commodore 64. It was called Maxit, I'm so thrilled to see an updated version :D
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This seems similar to a game I've played somewhere. I don't remember but this version is definitely better. Great work. Graphics and such look great