A few days ago, we received a private message from a fan called David Rogers who discovered a Sega Mega Drive/Genesis ROM which appears to be prototype of Fantastic Dizzy.

He discovered the ROM on the server of the 'English Amiga Board' in a collection of other Sega ROMs.

You can download it here. (Requires a Sega Mega Drive Emulator to run)
- DOWNLOAD PROTOTYPE

Further details aswell such as more screenshots and descriptions can be read on the Community Forums.
- The thread talking about the prototype
 
Again, there is lot more differences than what's been mentioned here.
Feel free to explore the prototype.