Only played a little bit so far but I really like it, wanted to offer my praise along with some criticisms too.
-The art and aesthetics are fucking awesome. I love the style and animation work. Everything is very bouncy, like how the map tiles look like they're hovering. Also the mix of 3D for your weapon in the top right.
-The Isometric perspective isn't something you see very often in these sort of games, and although the rooms are small, they feel a bit bigger thanks to the verticality which leads me to...
-The jump, and the fact you can shoot in the air. I get the idea its mostly for aerial enemies, and it takes some getting used to to hit them, but you seem to have made them a bit weaker to compensate health wise which feels pretty good.
-The voice clips sound unprofessional, but I consider that a good thing. There's kind of an expectation of what audio is supposed to sound like in a game these days, whereas the audio in this game feels like its more dated and from a different era.
-The lighting is super good. This goes along with aesthetics, but the shadows and the shadow enemies on the floor are very interesting.
-I've only heard 3 songs so far, but I enjoy the music a lot.
-Stay on a floor too long and... I encountered and killed that big hulking thing. It took my entire magnum ammo and a bunch of shotgun after that, but I was scared for my life the whole time because the first time he killed me in one hit, maybe its one hit every time? where's my medal?
Some Criticisms
-The pots have a lot of health. Maybe its dependent on the weapon and how many shots go into them simultaneously, but they feel very tanky and i'm tempted to break all of them.
-enemies in general are quite healthy. I don't think this is necessarily a bad thing, I appreciate the challenge, But I think something could maybe be done to make the individual fights more satisfying while you don't have a weapon that can dispatch them quickly. Like maybe a charged shot, access to upgrades or some kind of specialization on the first floor, or enemies having some window where you can do more damage to them. Alternatively, disregard all that and keep it the same. I'm not a filthy casual, your game is fun.