So far, no Hamumu games are officially supported on Linux, though the upcoming Loonyland Tactics, being written in Flash, should work without any fuss once you have Flash installed. However, even now you can play the games on Linux. I would recommend trying the demo of the game first, in case it doesn't work for you after all. Note that I am writing this having used Ubuntu 9.04, and there are likely to be large differences between it and other distributions.