Download this crazy unique tower defense game, you have to scroll down a bit on the page! Right now I have the flash (.swf) loaded and play it through the browser, works pretty well! I want to sign it and convert the supplied .apk but my computer is getting repaired. Anyway check out the game, and maybe someone might convert it to native .bar??
I am in no way affiliated with the site, just enjoy playing the game on my playbook!