Nice work! I'm a dev too, so I thought I'd check the game out.
I think I encountered a bug here: 
The character was in the bottom-right corner, but when I jumped up to the roof, the camera bounds moved over to this other room with the boxes. Not sure if that was intentional or if the bounds of the box room was placed incorrectly.
One more thought: I like that you can't cancel your attacks into a parry, otherwise you could cheese the boss by parrying on reaction. However, because of this, it feels like the best strategy is to jab the boss instead of comboing. If you get locked in a combo when the boss attacks, you'll get hit, so it's safer to use individual attacks and wait for a chance to parry.
Could probably be fixed if the boss enters hitstun when you combo them - but you also don't want the player to button mash, either, so it's a little tricky. Just something to keep in mind.
Either way, great work so far!