I thought the game was very well put together. I didn't think it was nearly impossible as some people have implied on here. I've already gotten the all-silver medal and a couple of gold medals, and all together I have 6 achievements on the game. Yes, it is hard, but it's a good kind of hard, the kind that keeps you wanting to play it over and over again until you beat your old score. =)
Overall, I thought this game was very fun and put together. Good job!