SOOM!
About
Soom is a 90's styled fps. In other words it is a Doom clone.
I do not know if it is just me, but I find shooting guys (in games obviously) and listening to classical music suitable. So I added classical music to the game. It may sound weird to you, but I find it really entertaining.
I made the game in Raycasting Game Maker if you are interested.
The game offers 3 types of weapons and 12 levels. I finished the game in 17 minutes. You can watch it on YouTube.
Finally I would be really happy if you posted your favorite level in the comments.
Enjoy...