A very fun concept! The art is great as well! If I have one gripe with it though, it’s that it’s hard to control, and not because it’s in second person. I think there are three things that contribute to that.
The first problem is that it’s very hard to tell where you’re aiming, because you could be up to 22.5° off in either direction, and still get the “face-on” sprite. Ideally you’d only get the “face-on” sprite if you’re no more than a few degrees off.
The second problem is that enemies often look past you. You disappear from their view entirely a bit too easily. Increasing the FOV could help with this, though it could be more straight-forward to alter the movement of enemies, depending on how it’s been implemented.
The third problem (though I guess this might be more of a nitpick) are the tank controls. They make the game feel sluggish, which is not normally what you want from a shooter game.
Those are just suggestions though. I think the game is pretty good as it is, and certainly for being made in just two days.