Thanks for the comments, we're finalising the rest of the story now. We'll also add an end scene to show what happens after you beat the game. (and get rid of the next button)
Thanks for all the comments, we're getting loads of positive feedback. The black crates appear on less then half the levels and more often than not it's just one of them but they do add some variety to the levels if you're trying to get a high score. That said some of the more tricky levels have been rebalanced and there are fewer black crates around now. The game is still under constant balancing. The cannons that were added are also being tweaked so comments on those would be great.
Don't try to click AND drag the block (it doesn't work that way). Just CLICK on the Block you want to move/rotate. Confused me at first. Nicely polished graphics and a fun soundtrack.
@cooljon98 When the dialogue mentions gold blocks you need to destroy all gold blocks to win. Normally it's just 50% to pass. The markers on the destruction meter show you the percentage.
@kilo45 Unity plugin is pretty safe, it has a security sandbox that prevents it accessing data from external domains and can't write to areas outside the sandbox even if you wanted to. You can see all the data cached by every unity game in the unity dash board which you can clear at any time.
To Install unity you just click on the link or visit http://unity3d.com/webplayer/