Sorry to hear that. If you just bought it, you can likely go trade it in for a slightly better phone that will allow you to run Flash and the Kong App. It should only cost about $50 more; I bought my Nexus with no contract for only $150 from Koodo. The Kongregate App, and the fact that it’s better in literally every way, is the reason I bought a Nexus instead of an iPhone 4.
The people who posted above probably know more about it than I do, but I don’t think screen size or processor has anything to do with it. If you can install Adobe Flash Player, you can install the Kongregate Arcade App… Although I could be wrong.