@AlexanderTheGreat Its a 2D sidescroller developed by id software, the Super Mario of PC gaming. This Keen game was released and owned by game development company Softdisk. This special release has brand new content and a more modern UI and game user features. Its about the adventures of Billy Blaze, aka Commander Keen and his fight with the veggies after being sent to his room after neglecting to eat his vegetables.
It was developed by Id Software back in 1991, a 2D platformer for the PC. Bethesda likely has the distribution rights to this game, no idea who Diplodocus Games is.