Seems far from being complete, encountered a lot of bugs too, e.i. guns kept switching between themselves on their own; couldn't kill the scorpion thing in the beginning even after getting ammo. Took me awhile to figure out how to play, kept clicking "start" but nothing would happen, then I saw that it asked for a name, perhaps make that more pronounced/noticeable. There's nowhere to go in the 1st level too, you just get a little ahead and fall to your death after.
Other than that try working on it some more, concept doesn't seem bad and I do believe people would be open to help you on improving things.
