I also got this error message.
This game is ok, but better level design would be very beneficial. Also, the UI is broken at 1280x 720 resolution.
You have to allow the program to run. There should be a more options button in the pop-up that will allow you to do this.
Ok, I've played this game a bit. The existing features are pretty good. I hope you can add a push button or a drag button for corpses and moveable objects. However, the ranged enemies are too hard, so maybe you could change that first?
That's fine.
This game is amazing! It would be so much better with a campaign though...