SilverStitch has made a game called Colour My Heart. And Heartbeats is used as a main theme there.
I have to say it's more like an art rather than a game though. But it's very nicely done. If the atmosphere catches you, it will hold you till the end.
Definately check it out!
I'm really amazed by the response.
Thank you guys for the support ;)
Thanks to Holograf for making the sheets.