What would be the Rules (general principals, norms & moral guidelines) and Goal of the game?
What kind of incentive and punishment are you giving yourself (You, the Player)?
What activities, interactions and accomplishments would you earn 'points' for?
What kind of points would you like to score?
Would you go for accumulation of Wealth (currently measured in a relative subjective form of Currency: Money) or maybe another value good like: Gold, Clean Water or Energy-units?
Also directly related: What kind of Bad (like waste and garbage) should you avoid or deal with?
The interesting (self-reflecting) factor in your Life as a Game begins when you start thinking about your passions, the things you really like to do (normally: things that give you energy), your natural skills, and your success-variables.
[Changing Rules]
The New Economy, and life within this economy has new rules. The new consumers label themselves as Fans (Apple inc.) vs Customers (Microsoft) which adds a new dimension to Brands. People tend to be loyal to their personality patterns, or put differently: "people don't like to change their common behavior". Brand loyalty can be measured in real life (a tendency to buy one product over the other: ceteris paribus) but in a game-setting these Brand aspects might be described in product-context terms like "Popularity" (based on current sales), or product Quality terms "component or ingredient declaration and Quality" (which is most frequently used), "Industry Standard", "Connectivity & Usability", "Open vs Closed Source", and the Cradle to Cradle (C2C) "Product Lifespan & Lifecycle". I would not be surprised if sustainability and social accountability (like ecological fair trade & treatment of employees) as a Brand value become more important. As an example: the iPhone application (Goodguide.com) scans and checks barcodes with databases revealing the context and lifecycle aspects of the product and Brand. This way you are able to score all aspects of a product (energetic, ecological, ethical, political and sustainable). For example if you want specific info about your ecological footprint you can add these values to your Life-game and make a purchase choice on a product-level.
Web 2.0 (inter-connectivity (RSS), personalized pages, communities) and Web 3.0 (mobile contextual info, meta-tags, and P2P tribes) changes the way we communicate and interact with others. You can see online companies adding interactivity to their communication with terms like dialog-marketing sending personalized mail (harvested by a contest, web-form or social networks). Amazon's personalized and customized recommendations based on previous orders and similarities with other customers in the data-pool are probably the best example.
Back to your Life-Game, some final thoughts:
What are your specific targets (within this context or arena)?
What resources will you use? (information, tools, materials, people, funding)
Other related info: Game Theory, Moral Psychology, WikiHow: Make-Your-Life-a-Roleplaying-Game, Goalsetting community: 43 Things]
