I still remember the first time I got a custom mix of characters and amenities working in MUGEN, it was awesome. I am honestly surprised more indie developers have not taken up the opportunities it represents. They don't have to release full on fighting games based on their games but the other stuff would rock.
Could you imagine level packs, sound effects etc based on games or characters?
RE: Mortal Kombat Project 2026 Released Bringing Massive Character Roster