I like the idea, simple fun, easy to replay, no bloat at all, though it does go pretty sloooow to rack up points... also just one medal for losses, but none for other milestones? ;) Would fuel you in a strife to a get a higher score with a few of those along the way there too...
Props for keeping it simple though! Nice idea. Just a little monotone without further reward, if you really don't have an endless supply of time and nothing else to do.
-cd-