This is a really cute, fun puzzle game!
I was going to use "nocart" to convert it to the GX4000 but currently you can't restart a level or return to the menu due to the lack of keyboard on the console.
Would it be possible for you to make an updated version where pressing P or the 2nd fire button brought up the menu in-game? That would allow players on the console to access the menu and restart or skip levels :)