Hi, I got done with the demo and I've got to say: I am so looking forward to future updates! That being said, a few things do stick out in my mind as of right now.
We could use Emotes, and a third class who utilizes Shivs and Bows. And actual Shiv/Bow drops.
I'm not asking much on the emotes side, but seeing cute little animations for the player characters would be amazing. A little 'blow kiss' for other players/Angela, a little dance, whatever you think of
As for the third class (We'll call them Rogue), I can see some decent potential in them. Having access to both the rapid-hitting Shivs and the long-range Bows gives a lot of harassment ability, letting them get in, stab, get out, and shoot. The big issue being what Rogue could have for skills. Perhaps racking up 'combo points' and cashing them in for big damage/recovery? Or adding a way to snag an extra loot item with the classic 'steal' ability? It's hard to tell what the Rogue could do to make it unique from Fighter, but there's plenty of time to figure things out.
Side note. There should totally be a way to parkour up to the top of every map, and a small reward for it, like a collectable. That's my only joke suggestion.
Looking forward to future updates!