Little but fun game with a simple game-mechanic. I like the whole mood and this very simplistic graphic-style. Think this fits perfectly to the theme.
I think you could have made it a bit more difficult the deeper you dive, else it gets a bit "boring" after a few minutes.
The obstacles are a bit hard to identify, maybe make them a bit more obvious (e.g. like the enemies or so...). And it's a bit hard too understand (and actually still do not fully know^^) why/when exactly the weapons go "offline".
But all in all a fun one.