Wow! Someone else had the same issue and it was a problem caused by the browser. I had the same issue with other games. Sorry but I really can't help you in this case cause it really has nothing to do with the game. Try again later or with a different browser, maybe Firefox (is the one that I use).
Nice concept. May be you should add other kinds of removable pixels(more resistant ones, regeneration, hidden...), or may be I don't go further enough in the game. Does there statistics board somewhere ?
I imagine easily this game one touchscreen.
Yea I like how it's 1337