Not so easy as it would seem from the first couple of levels. You also have some pretty interesting ideas, so every level has something new in it. The graphics might use some tweaking (sometimes the ball overlaps) and the "punch" sound when you die can get annoying quickly. Aside from that, it's a good, enjoyable game.
About medals, if it helps, there's a guide in NG wiki (http://www.newgrounds.com/wiki/creator-resources/flash-api/adding-medals-to-your-game) and a slightly outdated here (http://www.newgrounds.com/portal/view/549612). They can be accessed in Project System/your game/API tools.