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!
EDIT:
I'm really amazed by the response.
Thank you guys for the support ;)
SHEETS:
Scribd
Thanks to Holograf for making the sheets.
ChampIDC
I'm definitely glad I ran into the flash. I don't think it would have been the same without Heartbeats in it. Your piece caught my attention more than anything else in the flash.
broove
The song makes the atmosphere. But so does the graphics and the message. At least that's how I perceive it.
But I'm glad you like the song. It encourages me to make music.
Thanks again ;)