I would like to ask:
What midnight twist of unspeakable evil lead men to adapt a videogame based on overwhelming difficulty to 5e D&D which is designed to be fairly simple and balanced...
... When Hackmaster is -right there-?!
The answer is Steamforged Games. They have done a number of 5E variants such as Animal Adventures
(which was composed of two separate kickstarters (Dungeons and Doggies/Cats and Catacombs which were originally minatures+ followed by their equivalent of "Uearthed Arcarna" for playing as Dog/Cat pcs in 5E.) which was then combined together into a whole new variant/combo of both known as Secrets of Gullet Cove.
Later this year a further expansion of Animal Adventures
known as The Faraway Sea
is coming which introduces other playable animals such as Pigs, Goats, Foxes, Rabbits and a bunch more for 5E.
Steamforged Games is also the masterminds behind the Dark Souls
trading card game as well as Dark Souls: The Boardgame.
Intentionally enough, the classes in*Dark Souls: The Boardgame* are the VERY SAME EXACT classes in Dark Souls: TTRPG.