Shorten direction enum flags

Remove DIR_ prefix, as you need to prefix flag with full enum name, i.e.
Direction.UP.

Player.gd

@@ -15,10 +15,10 @@ var alive = true
 
 # Enum
 enum Direction {
-	DIR_UP = 0
-	DIR_RIGHT = 1
-	DIR_DOWN = 2
-	DIR_LEFT = 3
+	UP = 0
+	RIGHT = 1
+	DOWN = 2
+	LEFT = 3
 }
 
 # Movement
@@ -27,7 +27,7 @@ var posiy
 var dirx = 0
 var diry = 0
 
-export var dire = Direction.DIR_UP
+export var dire = Direction.UP
 var dire_delta = 0
 
 var is_moving = false
@@ -106,11 +106,11 @@ func _on_crash(b):
 func turn(dir:int):
 	dirx = 0
 	diry = 0
-	if dir == Direction.DIR_UP:
+	if dir == Direction.UP:
 		diry -= 1
-	elif dir == Direction.DIR_RIGHT:
+	elif dir == Direction.RIGHT:
 		dirx += 1
-	elif dir == Direction.DIR_DOWN:
+	elif dir == Direction.DOWN:
 		diry += 1
 	else:
 		dirx -= 1