It's unfair if cats overlap milk. Instead of lagging, I would prefer some crash animation when I go offroad. Mouse pointer could have been hidden for better overall look.

The concept is simple and clear, no need for instructions, I like it.

Please double check the dimensions because NG tends to reset them to 640 by 480 whenever you upload an update. Embed your fonts because text looks a little off-center and cropped on my computer.