Thanks to those that helped, but there's probably no point to continue with it because of the infinately better ones in the gallery and the news page. :)
Oh and the layers tabs are just for show at the moment. :)
And I must say I'm quite proud of the way I drew only the tiles that are on the screen. Took me a few hours of staring at the ceiling, but I managed to figure it out. :)
Oh, and you aren't limited to a certain size of tiles so it also makes it a good arkanoid editor.