Ah finally, someone who know tower bloxx ! The flood and the different block shapes and their center of mass also pump up the difficulty a bit.
BUT, Normally the game should be even harder than that... cause I had to "froze" all the blocks that are not rendered on the screen, cause it is normally impossible for anyone to build a tower that high without collapsing it ! It would have been frustrating for the player, the game is way more fun like that and and it contributes to the optimization cause I delete the blocks after a certain time...
The game is render in 800x450 px with no linear sampling, and all the black outlines are 2px wide NOT 1 px wide thats what make this aliasing effect while preserving the texture details ; )
PS: oh and the objects are always drawn at "integer position", thats mean objects cant be drawn between pixel