The amazing devs and team at Digital Extremes have set the bar for online grindy shooters. Warframe is, for a F2P game, amazingly well-crafted and dangerously deep.

While it may be better suited to mobile these days, World of Goo is a great puzzle/bridge-building game with a simple mechanic it explores well.

A fresh, visceral and addictive hyperactive trip of ultraviolence, strategy and style. Finds its rhythm immediately and sticks the landing. Hell of a soundtrack too.