Okay, please use the ddnoa_win7.exe in order to play. There will be a debug box but you can ignore that :)
ddnoa_win7.exe briefly shows the debug box but still doesn't launch the game for me. I tried ddnoa_32_v2.exe and that did work, but I thought it was broken because I could figure out the controls. ddnoa.exe also seems to work now, and I did figure out the controls with that version (it seems to be WASD + 'F' to select an action, but you need to select an action when it says "player turn" and the turns are time-based so it's kind of an RTS although you're limited to one attack per turn).
Windows issues aside, I thought that was neat. I tried to see if there was some sort of pacifist ending, since the messages seemed to imply there was some other possible outcome, so I took the final enemy down to its final sliver of health then didn't take the last shot. What ended up happening was that I got killed and then, when I went to start a new game, the boss and my body and the boss remained on the top level and I kept getting killed over and over before my reincarnated body could make it to the devil on the lower level. I feel like this is symbolic of something, but I'm not sure what.
Pictured above: me, in purgatory.