Nothing to test with except for my laptop atm, but interesting little puzzle game benny! 
Reminds me of some of the ice block puzzles from zelda, the colors add a whole new layer of depth though. Well done!
Thanks for the nice comment, mate!
Tested on my Galaxy SII, it seems very unresponsive - getting the menu buttons to register takes a few prods and in-game sometimes the blocks completely refuse to move. The framerate is also quite bad in page transitions and when the blocks are sliding. For some reason the fade/rotate effect when blocks disappear is fine with a very smooth framerate.
The phone normally performs very well, at least in my own HTML5 experiments, and you don't seem to be using canvas so there shouldn't be any problem with hardware acceleration.
Otherwise, I find the game concept very neat, and the puzzles are very challenging and satisfying to figure out.
Thanks for testing. Interesting to hear the difference performance issue on Galaxy SII. And you are right. With
this game I use only normal div elements with CSS3. As far as the browser supports it, the CSS3 transition should
be hardware accelerated - if not, it fall backs on normal rendering (updating position via javascript).
The animation's a bit choppy on my Nexus 1, but still totally playable.
gg!
Jim
Thanks mate. Much appreciated.
I have check on Ipad 2 and it run so well 
I am stuck on Level 11 at the moment...
Excellent Puzzle game and good workout for Brain

I will have check on Nexus 7 next to let you know and it should run so well 
Thanks Hotshot. I am glad that you like it. Nexus7 would be indeed interesting. If you need help on lvl 11 just drop me a PM and I will try to explain the solution.
Again - big thanks for testing. I will update the device list in my first post.