Glad you're enjoying it! I agree that the character movement is generally pretty unpleasant (like you said, mostly due to that extra inertia when you move). I might come back to this eventually and tighten it up, or expand it into a bigger game, we'll see. :)
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I tested with a friend who is "red-green" color blind (the most common) and he helped me pick colors that he could easily distinguish. The letters were actually just an aesthetic choice, but you're right - adding them to the boxes would be a good fail-safe. I'm on it!