Finally managed to get this version launched, it was coded in C and uses the great gbdk-2020 library. There were a few issues I found when porting from the GameBoy to the Master System. I suspect the issues were caused by me, as some function parameters take different sized data to do the same things on the Master System. So you have to double check your code, to make sure the function parameters match the system when porting from one to another. For example the GameBoy color uses 16 bit numbers for its colour palettes where as the Master system only uses 1 byte to select a colour from its colour ranges. Some other differences are in plotting tiles, as the Master System writes 2 bytes to its tile map, where as the GameBoy Color needs to write tile IDs to one TileMap and then an attribute byte to its attribute map. Another major difference is creating sounds, the GameBoy has some nice functionality out of the box, where as on the Master System and GameGear you have to do all this your self. One of the limits on this game is that it needs to fit in the default 32k ROM, which gbdk projects default to, other wise you have to play around with switching ROM banks and splitting code in to 16k ROM segments, which can be painful to do. This is why I also thought it would be a good idea to port this game over to the Master System, as it doesn't use Bank Switching at all.  Also by keeping the graphics minimal at 8x8 pixel tiles, It helps to keep the game action all on screen at once. Where as when you start using bigger graphics, the action ends up being more spread out and also complex scrolling is needed. I have new assets ready for RingDash8 to build over this project and would use different graphics and levels, I just need to know what people think of this version first and also how many Master System fans even visit Itch.

If you are interested, I have a few videos on my YouTube channel on coding on the Master System using C and GBDK. My channel is called Retro C Game Programming.

Bri G