I got an idea... How about, every game you play, you earn some $$$ which, you keep. Then you can buy a baby suit for your cute little alien, or a diaper for your little human boy, and run around half naked? Oh, you can also buy a strapon, so you can make some love to a male alien xD ISNT IT GREAT? w00t im k00
Ok now, how about instead, you earn $$ and you can buy different colors for your alien, or you can buy some equipment, like your alien whenever you upgrade, for that type or w/e you can upgrade your claws, so you do more damage, or some stuff... you know, dont make it like WoW, but make it so you can actually carry your legend. That way its like a ladder or some sort of thing... Even get carapace upgrades like StarCraft, except like there is a certain amount of games it can be used for like, 35 games. Every human kill gives you like depending on the last hit of damage, you get that much $$$, and yeah... just an idea...