@DSSiege11, Something you may wish to consider (or maybe not):
When a pixel on the display is on, it draws power. When a pixel is off, it doesn't. (Each pixel is a tiny LED). So, a game such as Arduventure, which has a white background with relatively few black objects, will draw more power than the same game would with a black background and white objects.
How much more power? It's hard to say for sure (without measuring it) but we can do a very rough calculation.
First we have to account for all the things that draw current other than the display pixels. With the Arduboy running on its battery, this would mostly be the processor, the speaker, and the control logic in the display (unless you use the RGB LED but we'll assume not).
It's hard to determine what the processor will draw. It depends on its clock speed, operating voltage, what internal peripherals are enabled and in use, whether it's being put to sleep when idle, and a few other factors. Based on the specifications and charts in the data sheet, I'd guess it to be about 15mA or less. It's probably quite a bit less but we'll use 15mA as a worst case.
Unless your game plays continuous music and sound effects the speaker will likely draw less than a milliamp on average. I think we can lump it in with the 15mA value for the processor.
The current drawn by the display control logic is less than 0.3mA so it doesn't really need to be considered. We'll assume 15mA for everything other than the display pixels.
Now, according to the datasheet, the values given for the display are (typical) 8.8mA with 30% of the display lit, 14.0mA for 50%, and 24.9mA for 100%. I don't know the percentage of pixels that your game has lit, on average, but lets say that it will draw 20mA as is and it would be 10mA if you reversed it.
Given an average 15mA for the rest of the circuitry, then with black objects on white the total current would be 15mA + 20mA = 35mA. For white objects on black it would be 15mA + 10mA = 25mA.
The battery is rated 180mAh (milliamp hours). Using this we can estimate run time from a fully charged battery:
Black objects on white:
180mAh / 35mA = 5.14 hours
White objects on black:
180mAh / 25mA = 7.20 hours, which is about 40% longer
Note that this is a very rough estimate. If the processor averages less than 15mA and/or the black on white vs. white on black current difference is higher, then the amount of extra run time on the battery will be even greater.
Bottom line: The less the average number of pixels turned on, the longer the battery life.
Take that as you will.