Yeah the first 'victory' is kind of the start of the game, as Steiner said. If you're not enjoying it a lot feel free to quit, but there is literally so much more to the game after your first clear.
but if you leave it for Pizza Tower, fair.
http://28.media.tumblr.com/tumblr_lcb35gGx0t1qailr4o1_500.gif
http://www.megavideo.com/?v=57N0YAEJ