Wait, I'm a bit confused bro
@vialli82, so this is an emulator hack, or is it an add-on for those who actually have the actual Mega Drive/Sega Genesis console?? I just took a look at Final Fight and Astebros from your video (I wasn't familiar with the latter game, looks very cool it looks like it is a new game kind of similar to Cathedral, very much a type of platformer I would like!) and the graphics improvements are definitely there! I don't quite understand what it is though, because they are also mentioning that it can create new games but in anycase it looks really cool!
Edit: Here I found a longplay of Astebros, VERY cool BTW!
Astero is an
original game, that's what following Sega MD hacking is really became super interesting those time. It exploded let's say 5 years ago.
To answer to
@slamsoze those game are made to run on a real hardware

like every hack in fact with some exception. I'll explain in big.
In fact, there's all "new" ports which never have been ported to Megadrive (like Final Fight MD) and compatible with the real Hardware, which is supporting a 64 MB cartdrige (more than enough from that time).
Let's takes some game for example like MK1 Ultimate (or a name like that) on Megadrive : it looks FAR better than the original (
EDIT / MD original not the Arcade one obviously) with more animations, sprites reworked with better colors, except the sound and some very small animation the whole package looks more like the Arcade version. Well i ain't a super fan of the 1st MK, but it's impressive what people can do with a "simple" megadrive, but a megadrive totally unleashed and with all tools to improve each games.
For Snes there's one game completely independant out 15 years ago, a plateformer. Don't worry, as there's tons of Megadrive fans doing crazy thing, Snes fans will counterattack in a super fair fighting for all retrogamers

BUT all those hack with exceptions. I'm also a Snes fans but they don't push it that far as others people did on Megadrive... For the moment 😉
Example : the 16:9 MarioKart made for Bsnes HD, a powerfull emulator. Those one AREN'T compatible with the original console, but they're very, very rare.
Just some things to know:
On the past, when they ported a game, of they judged the colors "at the eye" more or less, or they wanted to change some colors for make it looking Megadrive or SNES authentic... But what we wanted was Arcade perfect (almost of course).
Now, modders extract the real 255/255/255 colors from the Arcade version and assign it, redesign sprite etc. it's a hard work and 16 bits hacking another world lol. Tons of passionate people.
I don't like Hack at all with different story or completely changing the game, putting Zelda on SMB3 etc. Or a sprite from TNMT on Street of rage etc.
But what's called "hack improvement" focus on the real game issues, colours, animations, like it should have been done 20-30 years ago 🥰 BUT i also got a big love for authentic old version untouched. Just that it's giving a new life to games you think to have enough of it.
Well it was like always limitations due to money of a cartrdrige memory. from 8 to 64 Mega at the time or with a special ship was decided by Sega or Nintendo if they wanted the cartdrige cost acceptable or expensive if they were certain everyone will rush on it. So devs should do with their own weapons.
Now there isn't that kind of limitation so it's very open to improvement, which doesn't means that every games need 64 mb, often 32 or 24 is enough of course.
I forgot:
There's no cartdrige often except on some website, you just need an Everdrive to put the rom and put it on your Megadrive, Snes, N64 etc.
Everdrive is available for almost every console with a cartdrige. Hacks on CD don't need it.