I really like Zarlor Mercenary. Fantastic shooting action, quite challenging, very good graphics and sound for the lynx, very good graphics indeed. Only 6 levels but they're a good 5mins long each. You have a choice of characters to use, each has a certain extra weapon or ability such as homer laser, speed etc. You can buy upgrades for your ship too. A little slowdown, but only when there is a helluva lot going on.