good idea, maybe add a timer so you are racing against time. make it more challenging, longer - or maybe make it into a number of levels, which progressively get harder. good try though 5/5
this is the most bugged game ive ever played. in the middle of typing this comment, the number of blocks grew so big that it crashed my browser (love it when that happens); so i had to force-close the window and reload the page just to finish this comment. fail.
lvl 30 completed =D ... but where's my achievement ???? sugar!! already got it and NOW i realise :p aah well ... completed the game twice, without even realising 5/5 !!!