Well done on the atmosphere and the setting, really chilly vibes and a great premise. That said, the grid crawling part is barely there, which is a shame, because I think this idea could really be a very cool thing. As mentioned by others, you could unify the navigation and the shooting, since there really isn't much need for you to manually travel to either gun (and maybe have a toggle for which gun you'd be shooting) and just have the game be about exploring this sea of lost souls.
Would really love to see this one fleshed out into an entire experience!