Nice game! You really managed to come up with a very appealing aesthetic: the whole presentation of the game and its page, the menus and most importantly the game world itself really stood out to me. I especially like the grain and other post-processing effects you added to give the game the old-timey effect. I find the look and feel of the game really turned out very well.
And the gameplay itself is also great! I had a lot of fun kiting the enemies around and trying to pull off the trick shots in order to dispatch them. You did a fantastic job making them stand out with the flare particle effects and having to aim over my characters shoulder was challenging but became more manageable with practice (unfortunately my skill in this kind of game is limited so I didn't make it that far, but I'll probably come back for another crack at it!).
My criticism here would be that I did have trouble with losing my crosshair and reading the characters rotation in a tense moment caused undue difficulty in my opinion. I feel like it might almost be worth breaking the black and white colour palette to make the crosshair really stand out! I really love the fact you managed to incorporate an upgrade system, but despite that I felt like the boss enemies were a bit too tough. As a minor technical note, I thought I'd point out that its not possible to install your game via the itch app because you didn't have the .exe file directly inside the .rar, so I had to download it manually instead.
All in all, I can't believe that I'm the first one to comment on your game, since it certainly deserves better and I hope the good ratings start pouring in!