One of the biggest things I wanted from the game was to be able to play a grid-based adventure with friends over lunch. It would have to be relatively self contained in size, so nothing spanning like an Arkham Horror. I came up with this attack system where you could attack other units that were adjacent to your character, but depending how you were attacking would alter the result. For example, attacking an enemy behind you was possible, but at a detriment to your attack roll. These were all based on your hero tile on the map and what way it was facing.
But trying to keep the game portable and fun became a challenge. Since the information on each 2" wood tile was limited, the game environments became very narrow and ultimately too crowded to have fun. I decided to take a page from the Pathfinder Adventure Card Game: Rise of the Runelords Base Set game and the Lord Of The Rings: The Card Game where players occupied the same location, but weren't designated to an actual grid on a map.
I still wanted to keep the orientation and location where enemies were attacking, so I kept that in the game. When enemies spawn you roll 1d4 (a 4-sided die) and that determines where the enemy attacks from. Maybe an alien pops up from behind you.
Anyhow, I'll post more about the rules in the near future. The revamp of the rules has taken up all of my driving time the last few days. I'd sit in traffic, listen to the Tron soundtrack, and just think.