If anyone likes SEGA and any of its consoles you might want to read here:
http://www.atani-software.net/segabase/ . This site holds an indepth history of SEGA's consoles from it's beginnings in the ARCADE industry right through the demise of the Dreamcast.
As for the "Heart of the Alien". I have the US SegaCD version of the game (it also includes "Out of the World/Another World"). You control the Alien in this game, and I have to admit I haven't gotten around to playing it much.

Someone mentionned about playing it on the Dreamcast, well you might be able to if you go here:
http://www.dcemulation.com/ . They do list two Genesis emulators, but I don't know if they cover SegaCD/MegaCD functionality.
There's possibly an AmigaEmulator out (I've quickly looked through GOOGLE and saw that there's at least one PC emulator for SEGACD.)
With this said, if someone is interested in seeing more of this game I can try and get a few screen captures and/or capture some video. Let me know which format though.