Great game ; maybe move could have been "GetKeyDown" instead of "GetKey" as it happened quite a lot that I moved two tiles when I wanted to move by one tile only.
Good job !
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I also found that it was hard to move precisely, but if you had to press the button again every time it would get annoying and tiring, and I decided that was a worse option. Maybe in a later version, I might add an option to change it, or make WASD move as it does now and the arrow keys move one at a time.