Nice game, but buggy
The game itself is nice, pixelated environment and tandy music have their charms no matter how much used.
You coined the old team-work game form pretty fine, but the game lack anything original, aside the connection to valentine's day, through which I assume this flash got to frotnt page, but as a "valentine present" I think it'll do.
One thing though - when I gathered the required 75 hearts (somehow I gathered 76 hearts even), it triggered my sound system off - using laptop with speakers connected to it, it seemed to confuse the laptop, and the audio stream flew both from external speakers as also laptop speakers. I am using Opera and Windows XP, with integrated Realtecl soundcard. Though I doubt this information will help you as a flash creator, please, try removing the sound bug :(
Overally 6/10 for your work.