Sadly I can't go very far with only one hp but I might rate it if you update it with a bit more gameplay. I would suggest to make the enemies move a bit, and they looks like tank so having them to move weird way would be great. Also the combat is pretty pointless for the moment, you shot, they shot, bullet collides, nothing. You can dodge but again I would suggest having reloading time for them. Like a blaze in minecraft, multiples shots, reload, and shot again. And adding a point to take risks, because I end up facing one enemy and waiting for it to die. Good luck for your game !