A high-res version of Hellfire Factory can be found here:

itch: https://ragtorstone.itch.io/hellfire-factory-full

patreon: Ragtor

The differences are visual/graphical only, the game content is the same. Please try the free version before getting the donation version to make sure the game runs well on your PC, and that you like what the game has to offer.

Thanks for your support!