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You need a programmer and a programmable cart. 

The ROM is not large so a 2 meg cart with SRAM is good enough. 

You can get the flashkit and carts from AliExpress for not much money.

I did some testing and my results are the same as yours for all my American systems with TMSS. 

I originally said I tested Genesis 2, the was a mistake. I thought I tested the standalone cart there but I must have been mistaken. I apologize.

Here are my full results:

1x Mega Drive 1 no TMSS - working

1x Genesis 1 no TMSS - working

2x Genesis 1 TMSS - not working

1x Mega Drive 2  - working

2x Genesis 2 - not working 

1x Genesis 3 VA1 (mod to support 32x/CD) - not working

1x Genesis 3 VA2 - not working

All Genesis 2/3 and Mega Drive 2 have TMSS.

So, North American systems with TMSS are not working. 

It's possibly something in the code. 

Hoffman might be interested since it impacts flash carts too.

Very interesting.

My mega drive 2 is TMSS and it works fine. 

I'll try a TMSS Genesis.

I programmed this card and it worked on mega drive 1 and mega drive 2.

Do other games you are flashing work?

I have some non-battery 4MB carts. 

I'll try 1 later today.

I have no way to test PAL.

This is what my cart looks like. 

Now the I've looked at AliExpress carts, I actually don't know where I got it cuz it doesn't look like a typical AliExpress cart.

It looks like those xxx in 1 game carts they sell in AliExpress, Amazon, and eBay but I've never bought one of those. 

I made another cart on a dragondrive and it seems to work as well: 

https://dragonbox.de/en/products-for-sega-megadrive/dragondrive-4mb-megadrive-fl...

I just used the dragondrive as a test because that cart is usually cave story.

You're welcome. 

I'm using programmable carts from ali express that have battery backup.

They work great.

I've played the game through.

Edit:

Systems tested - mega drive 2, mega drive 1 VA1, MegaSG, Genesis 1, Genesis 2.

You're welcome.

Here is the cover.

The 6.1 MB png can be found here: https://limewire.com/d/7aWr6#nGJyvYqNB2

Here it is.

I used these dimensions when printing: W: 78mm H: 68.5mm

I generate the pdf to print using this site: https://www.avery.com/templates

I just use the blank template. 

I am using a cheap HP Inkjet printer.

JOYEZA glossy vinyl sticker paper for the label. 

Epson matte legal size presentation paper for the insert.

I designed the insert and cartridge label (obviously not the artwork).

I use Avery online design tool to generate a PDF for the label. I usually do 3 to a sheet in case I make a mistake cutting. I print the PDF with Adobe Acrobat. Avery design tool helps set the labels to the correct size.

I cut out the label and insert on a plastic cutting board using an exacto knife. I use a large metal ruler as a straight edge. 

I use a 3mm corner rounder on the labels.

Thecoverproject.net forums have tutorials that are helpful.

YouTube has video tutorials that can be helpful. 

After some trial and error it's very easy for me to make a cart now.

With the current high price of authentic carts, I mostly make my own now. 

I don't care if the cart is authentic. I care that it works.

I don't have any more blank carts with save RAM or I gladly would.

Thanks! I just tried it and it works great. I enjoyed the ending. 

I like your port so much I made myself a cart.

It works fine on my MegaSD.

I got the ladder crash bug at the end but everything else was great.

I never gave this game a shot until the port. Now I think I'll play it over and over again.

Thanks a lot.

I'm sure at this point. I've been playing on special and I have 5 health and 4 lives displayed on the HUD.

I think it's actually easier. 5 lives and life bars maybe.

I respectfully think you should consider that he knows he changed the color of the background.

I'm sure you as a tester would be a real treat.

Thank you very much!

Comments like yours are a good way to discourage someone from offering us many more hours of their hard work FOR FREE in the future.

I can see mentioning the feather because he might be interested. I think it might also be somewhat hardware specific. 

The comments about the colors being different in a few cases are completely unnecessary and come off as nit picking or OCD.

hOffman has acknowledged that there are some differences. 

Enjoy the game, say thank you, and don't nit pick.