The game will be out on win/mac/linux as well as android.
It will also be available on xbox360/one, WiiU and in the future PS3/4.
At last it will also be be available on the Dreamcast as it was initially planned.
The HD version will feature the original game version as well as the switchable enhanced HD version.
Moreover you can choose any time between fm sound (Megadrive chiptune music) or PCM (CD music only available if you had a Mega CD attached)
For computer spec, sorry but I don't know, you should ask on the facebook page.
www.facebook.com/watermelongam…