This was way more difficult than what I expected it to be, but way more fun too.
- I would give the player more HP at the start, and maybe make him move a little bit faster, and gradually increase the difficulty level.
- Something indicating the weapon you are using at the moment and if you are or not in god mode would be a good addition to the UI.
Finally, not related to the game, but the readme file was amusing too.
Hope to see more progress on this game soon.