Gran Skrea Online is an MMORPG with retro-styled graphics.
Business Model: Retail Price - $9.99 on Steam
Classes: Gran Skrea has a classless system that lets you level up any of over 20 skills, both combat and crafting focused.
Open World PvP: Attack anyone anywhere, but be warned, there is a justice system.
Build a Home: Build a player home, then trade or sell it.