Hello Pupkin,
While playing with your asset pack in Godot I noticed that the player folder has the text file specifying 8x13 Cells.
However, I discovered that the cells are actually 10x13. Not sure if it's just a typing mistake or if it's Godot (or my project) doing something weird. But I just wanted to let you know in case it's indeed a mistake and you would want to correct it :)