Pretty nice looking effects, I think some lighting and shadows would add even more to the aesthetic. I think a collider was left on at the obvious outside door at the top so I can't comment on much of the level design.
I would appreciate a more visible prop for the flamethrower or some smoke effect before it started to blast.
I don't like how the camera cuts when the dash/blink happens, it's really jarring, the momentum stopping at the end hurts the flow too. When attacking while on the elevator you're locked in place and cannot move horizontally for a while after the attack finishes.
Keeping an eye on this for whenever you do add enemies to fight though.