Dance Magic - Casual 'Music' game developed and published by Targem Games. Game cost 10$~ in Steam but I got 2 keys (hope they work) for free and decide to do a giveaway.
Dance Magic Giveaway (Steam)
Key Features:
1. 7 diverse dance styles
2. Several thrilling locations
3. Rich character customization system
4. Includes more than 30 musical tracks (Can add your own tracks in game files)
5. Different playing modes including campaign, free dance, and playing with friends
6. Variety of difficulty settings

Dance Magic - Steam page.
Gameplay -
Dance Magic Giveaway last 48~ hours and after it over I chose 2 random winners.

Rules:
Share this giveaway on your facebook or twitter with #dancemagic #steam and upload the screenshot which shows that you have shared this event in the comments.
Example -
mmorpg giveaway
If you win I send you email with Instructions and Key.