Surprise! I decided to revisit the Genesis version of Polymino today and fix a bug which eluded me for ages! I also updated the menus for good measure, replacing the OPTIONS menu with an ABOUT screen that has information about the PC version. The only thing that was actually in the OPTIONS menu, the toggle to enable/disable music, was moved to the main menu.

Feel free to download the ROM at https://polymino.net/downloads, and share it around all you want, with attribution of course!