Unfortunately, this is not a simple fix because some of the logic was assuming that the tile size was a multiple of the movement speed. Breaking that assumption causes the enemies to be able to, for example, walk over a gap which they were supposed to fall into. The player's movement speed is 4 pixels per frame and changing the enemies' movement speed to 3 causes problems. I could make the enemy movement speed 2 and that'd probably work. In case I don't get around to a proper fix, do you think the game would be better changing the enemies to move at half the player's speed or, leaving them at the same speed at the player?