Sweet little relaxing game, available on steam.
It's a sidescrolling pickup/avoid game where you adjust a sine wave to control your path of travel.
The game's the epitome of the adage "easy to learn, hard to master";
The controls are extremely simplistic: to adjust the wave you only use the mouse, but when you stray from the beaten path and panic, you're fucked quite quickly.
Only downside is that, for some reason, it doesn't run in my monitor's native resolution, and I have to run it in 1600x900.