Right, this is a Unity/Linux bug where it incorrectly identifies your native resolution as 1 pixel by 1 pixel. I'm patching it now, hopefully it'll work for you. :)
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Aw thanks for letting me know! There were some QA issues with the Linux version that I couldn't resolve in time. Anyway, if you send an email to firstname.lastname@example.org, i can send you a "no promises" Linux build. :)
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. :)
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!