Still not using the whole screen on my Nexus 7. For tablets, most of them should be 1280x800 16:9, 1280x800 10.1" (Asus transformer, Xoom, Galaxy Tab, Lenovo, Toshiba, Acer), 1280x800 16:9 7" (Nexus 7), or double the res for the newer 10.1s.
Also I found the 24sec not nearly enough to build the tower. Maybe providing a way to adjust the time for beginners/normal/experts? Also, have you thought about allowing the computer to be one of the players (and no, training for one is not what I'm referring)? That will make it usable for individuals too and increase distribution. I also found distracting pulsating the graphics during the count down. After
fixing the most glaring issues, try to get your app reviewed by +Android Central +Android Police +Phandroid
Android and me, Android Community, Droid Life, etc.. Assuming good reviews, that is why I said after
fixing issues, that is a good method on getting a spike in users.