I did manage to upload a new version of the game this morning. Unfortunately I was unable to eliminate the black bars you are experiencing, as they are set by the camera's aspect ration, but I was able to adjust the UI elements so that they are now constrained to the camera view only.
A member registered Aug 06, 2021 · View creator page →
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Play as Santa, riding a horse disguised as a reindeer, and deliver gifts to all the “Nice” houses on the street.