This is a very enjoyable demo! I look incredibly forward for the finished product!
Some things that stood out to me is how noticeably stiff the movement works together with the camera. Since your character is restricted to a fixed 8 directions, this makes manoevering around very tricky, especially in tandem with the alternating fixed cameras. Trying to avoid incoming ranged attacks gets especially tricky when positioned somewhere the camera is guraranteed to switch, which can turn even your movement keys against you. In unprepared moments where you have to think fast, you may end up getting damage that could have been preventable as you try to wrestle against the controls to get outta dodge.
I've also had moments when I entered a new room or hallway where apparently an enemy was overseeing the door I just entered and didn't found out because the camera was facing away from everything completely, until I got shot from offscreen. Aiming has occasionally remedied this, but can become cumbersome if you encounter an enemy you'd prefer to face with a different weapon than the one you're currently aiming with.
That's currently all I have to offer for feedback! I'm looking forward to the rest of this game's development and I wish you good luck! My impression is overall good!