I really liked it. Great concept! I completed it on 2nd try. Liked the weapons, thought the scythe was the best, the magic was a little underpowered. I liked how you did the menu, very interactive and showed how the game would feel even before starting, and very cool art style.
The mouse was the aim, why not use mouse button to shoot? q is a little quirky to press when using wasd. Was the 2nd attack not implemented or did I miss it?
Not sure if it was gamemaker but there were several lag spikes while trying to play, even to the point where I thought browser had crashed.