Put Some G-Power In Your Weapons
GG2 offers 6 main weapons, each has a unique feel, ammunition, an alternate fire mode, a variety of unique power-ups and you can even level them up. Every time you kill enemies, they will drop small G letters. Collect them to power up your weapons to make them more and more deadly over time. But be aware! Each time an enemy hits you, you will lose a certain amount of G-Power.
Explore New Worlds
The game starts off in a small building, from which you have to escape. The more you explore, the more will the world open up. Get more and more items and power-ups that will give you the necessary abilities to reach new places. Find abandoned subway-stations to travel to far-away new places or go through portals and travel across the hellish parallel-dimension!
Power-Up Your Character
Another feature is the Power-Up system. Whenever you obtain special Power-Orbs in the game, you can use them in your status screen to upgrade ascpects, weapons or items of your character. You decide if a weapon should have more power, bigger clip size, faster fire rate etc, or if you need more protection, or better health supplies. Spend your Power-Orbs wisely to become more versatile or focus them to become a specialized killing machine. – Steam