Hi :), I've played the game and also made a video about it, maybe it is useful for you if you plan on continue developing the game. Moreover I wanted to give you some feedback about what I've played :)
-The main idea and mechanics work well, and the visual style is quite accurate for the kind of game it is.-Improving AI could be great to make it more difficult.
-The sound effects could be better specially the ones at the menu.
-Improving the switching weapons speed and the reloading of them could be awesome.
-In general making some tweaks here and there you could have a very well polished game to publish in steam for an small amount and people will surely buy it :)
Regards.