Hi there. I have created a patch that allows you to run the game without shaders -
Drag this .pk3 file over the AOH.exe and it will ignore all shaders - however, please bear in mind that if your computer was unable to run the game with shaders, it is likely that it is too low-end to play the game at any meaningful framerate.
Once the full game is released, we will be also releasing a 'replacer mod' that lets you play with any Doom custom content/wads - this should let you experience the gameplay, but without the detailed maps & shaders