Change up and down. The display here flips the location of pixel (0,0).

minixs/constants.py

 VERTICAL = 0
 HORIZONTAL = 1
 
-DOWN = 0
+UP = 0
 LEFT = 1
-UP = 2
+DOWN = 2
 RIGHT = 3
 
-DIRECTION_NAMES = [ "Down", "Left", "Up", "Right" ]
+DIRECTION_NAMES = [ "Up", "Left", "Down", "Right" ]