If this is your very first game, then that's understandable, well done, but there are a few reasons I don't think its that great:
1. The single medal, If you are going to make a game with medals, it needs to have some sort of pull to keep the player going, like multiple ones, or, a single one with challenge to it. because are just going to play this game for a free level, then never play it again.
2. And the 2nd (And last) one, Its not like a game, a game needs some excitement and thrills, or challenge.