I can't run this (Windows 8.1). I click on the .exe and all that happens is a pop-up that tries to open a file.

Same here

I can't run this either.

(Windows 8.1) I am not able to run the game. A pop-up appears asking me to open a file.

Same as the above (Windows 8.1)

Can't play, same problem, sorry :/

Can't play. It asks for a dll that it's not included.

Win7 64bit,
When I try to run the EXE it prompts me to open a file.
I opened the Source in Game Maker and played it.
Interesting idea with the 4 stances, things start to ramp up in difficulty after a bit which is nice. Some feedback to know if I've hit something and how much it hurt them or how much energy they have left would be nice.

I confirm the exe doesn't launch and prompt to open a file instead. I could launch through Game Maker: Studio though. The game is ok but a bit simple. I couldn't really feel any difficulty and was wondering if the spawning of the demons would change. I couldn't spot any gameplay difference between the stances, maybe you should have make them more obvious.

I've experienced the same problem as everyone else, but ran the source code in Game Maker and had a pretty good time.
The particle effects and lasting bloodstains on the walls all work very nicely, and the game is pretty fun for the first minute or so. After that, though, I felt it to be a little repetitive, since no new enemy types show up and you never have to do anything besides move turn left/right and hammer away at the left mouse button.
The idea of stances was really cool, but I feel like it fell flat in execution. I didn't really feel like any stance aside from the default one was really practical in any way, so I really left that feature alone. I also thought it was something of a missed opportunity not to have the character actually change their sprite slightly to reflect their battlestance.
Finally, I really have to encourage you not to use comic sans if you can avoid it. It's considered by many to be one of the least professional fonts available, and very few people will take your work seriously if you use comic sans.

All I got was a file open prompt. I'm on Windows 7 home premium, 64-bit