Super tight! Really neat little puzzle game. Interesting to me that like lights out or sudoku the solution is a set of moves rather than a sequence.
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Thank you! That enamored me too while exploring the mechanics. Subtraction is commutative, so it doesn't matter what order you do the operations in; there are many different valid first moves. On top of that, there are many different ways to reach the same end state (e.g. a board of all 1s can be cleared by tiling any shape except 'S'). All of that means some puzzles might look intimidating at first glance, but there are usually many different solutions, making it very likely the player will find one.