First functioning game!
EDIT: Changed cover image XD
EDIT: ARROW KEYS ONLY
(I don't know much Python) You could create a distance function to make your collision code a little more reusable:
Then you could create a simple class for circles and input the object's properties:
Pretty laggy. Easy fix though. change
clock.tick(60) (to make it 60 fps). The only problem with that is it will make the red circle move very fast, but you could just change the movement values.
Pretty cool to see sprites without classes!