A great combination of music, nice visuals, and a unique style of light strategy. Easy enough for casual players, with Bastion type difficulty settings.

The art is bright and fun, but the narrator really makes this game fantastic - narrating every move as you shoot and smash your way through the story.

Spiral Knights [Steam store page]
The graphics are cute and the game seems potentially fun, but it lags incredibly bad on my PC - and I'm not sure if it's a problem with the game itself or their servers coping with the player load. Regardless, unplayably laggy even when moving.

This is a fun but easy Diablo style dungeon crawler. It features quick travel via portals and spells, as well as a pet to sell items while you continue killing. Additionally there is a shared chest to transfer valuable items between characters