Congratulations on taking a magnificent concept and executing it horribly. The game is too long -- it's very easy to play a single level for fifteen minutes, only to make one mistake and end up losing your whole setup. 2/5
Originally rated 4, dropped to a 2. There's never any reason to use any tower other than the basic one... or touch any bombs. At least not up to level 22, where I got bored enough to quit playing. =\
You try to add 'twists' with all of these various blocks, but all it does is overcomplicate the game and make it totally unenjoyable. Especially the green blocks. Sorry, but this game was terribly executed.
It's not bad. Still feels like there's something lacking, though. Maybe in-game achievements like others have suggested. Also, could you make it so that the shop-info that appears on hover could appear more quickly. If not for the comments, I wouldn't have found that. >.>
Branches should be a very different colour from the trees in the background. Every time I died, it was because I didn't see the branch until after I hit it. Cute game, though.