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I'v sent you a contact request on your blog https://hoffman.home.blog/ for that

I added some precision on my initial post : in any case foreground layer issues always starts at level 2-1, before that everything is fine.
I'll try to make a cartridge with the roms you provided to see what happens, and if it's related to the multiMVS itself.

Hi
Here are the results of my tests on several configurations

- Analogue Pocket : seems to work perfectly

-NeoGeo AES with NeoSD pro : Works perfectly, except from my first attempt when I got foreground layer disapear at level 2-1 as I was playing. I lost a life, foreground was back, then it disapeared again, then followed misalignment of the main character's sprite and the background. After that, the game rebooted and everything has been normal since then, even after restarting the console, or just reloading the game via the NEOSD.

-NeoGeo MVS slot MV1FZS with Darksoft MultiMVS cart : First, BGM was not played in the correct order, but not randomly : same result at each attempt. Then arrived level 2-1 : no foreground layer at all, neither in level 2-3 and level 3-1 (I stopped here).
I managed to have BGM back in the correct order by changer the number in the "fpga" file (10 and 12 work, instead of 1337), but I can't find a way to have foreground displayed correctly. Maybe it's due to the "fpga" file. I read something about its meaning a couple of years ago on arcade-projects forum, but I can't find the topic. Games that have small graphic roms (like joyjoy kids) have "141" in that file. I'll try that to see if it works.

-NeoGeo AES with Phantom-1 converter and Darksoft MultiMVS cart : same as above.

EDIT : I forgot to mention : I think the loud metal noise when the first boss collapses is missing compare to the original game.

EDIT 2 : with 141 in the "fpga" file, BGM is messy again, and no foreground layer in level 2-1 (I haven't checked levels 2-3 and 3-1 and after)

I can test it too, on pocket and Darksoft's Multis. I'm very thrilled by your crazy project!