http://store.steampowered.com/app/425410/
💎💎💎💎💎💎💎💎
STEAM KEY REGION FREE GLOBAL

Rhythm-driven Gameplay
Move with the music to overcome even the most difficult hazards, like laser beams or insane camera angles trying to explode both your balls and your brain.
Dynamic Music and SFX
The dynamic music by Emmy-nominated composer Nicholas Singer is tailored to the rhythm and style of each level, with sound effects adjusting to the level's music. Without it, you'd fail even harder.
Epic Storyline
Not included. Instead, be guided by floor texts that make fun of you when you fail and drop awful puns even if you unexpectedly don't.

Scavenger Hunt
Discover secret areas that lead to other secret areas which in turn lead to other secret areas1. You get the idea, and maybe even the rainbow that awaits you at the end of the treasure. Probably you'll just google it though.
Speedrolling
Replay levels in Rush mode as fast as you can and prove that you are a good person by beating other players' highscores.

Style your Balls
Be rewarded with awesome bonus contents like tasty new colors2 and trail effects for your balls.
Did you just Twitch?
Enable Twitch integration and let the game mock not only you, but also your audience.
Workshop Integration
Community levels are probably better anyways - create and share your own challenges with the level editor.

1 May contain traces of you going nuts.
2 gluten-free

Activation Instructions:

1. You need to download and install Steam http://steampowered.com/download/SteamInstall.msi
2. Go to your account or register a new one.
3. Go to the "My Games" and select "Activate via Steam ...", and enter the key received after payment.
4. Once activated, the game will appear in the game list (Library) and you can download it