Hi, thank you for the lovely comment and yes, that bug was on a lack of testing on our part :(. Glad you liked and. Also could you point out where did you find use of sub-pixels ? I'm not sure about where that happens.
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That's okay, it's still a beautiful game. Subpixels are just the use of screen pixels that are not part of the main resolution grid. This means the game's total resolution is higher than 64x64. I'll attach a picture of what I'm talking about. I wouldn't worry about it too much for this jam, but I hope the feedback proves helpful in the future.
(Red lines were added by me to demonstrate edges)