First, thank you for getting this done. It's the best console version of Doom already, and getting better every new release!
I've been following this project since the public release, and have been playing all releases on real hardware.
Unfortunately, as I presumed, this new release doesn't work with Mega ED X5, that only has "partial SSF2" support. I tried with and without the Sega CD attached, and got the same "Z_Malloc: failed on 24" message:
I'm aware the patch now needs a SSF2 mapper compatible flash cart and reporting this just because I didn't find nothing about this specific ED model.
BTW, I confirmed super street fighter 2 works with the 32x attached, so, maybe, 32x resurrection can be supported by krikzz too.