Veeery solid!
Some enemies are placed so that the player cannot predict he will jump into them until it's too late.
And I'd suggest to adjust the controls scheme a bit: There is no reason to enforce mouse input for shooting as all of the other input comes through the keyboard. Also, if you simultaniously allow WASD and arrow keys, it would make sense to bind the up-arrow key to walk through doors as well.
But that's a highly specific criticism, overall, this game plays really well and the presentation (music, art, sound) is very good, too! 👍