Nice game! Fun to play :D
Is there only "Dungeon 1" or are there more levels? I cleared it completely, including the boss fight, as far as I'm aware.
I like the camera effect when shooting, it adds a lot to the feel of the game. I didn't like that I don't get any clear feedback when an enemy hits me, other than a healthbar losing health. This was especially tricky in the final bossfight when random minions spawn and you don't have any idea there's a new one clobbering you to death in an instant. I think there are sound cues but that's hard to focus on when clickspamming others to death, a visual cue would be a great addition I think.
Also, the UI popping up on death has some questionable button placement. When I was frantically clicking, and then died, I'd sometimes just immediately click on one of the options since it's right near the middle. When it brought me back to the hub I was a bit annoyed, thinking I lost my progress, but luckily that wasn't the case and I could immediately jump back into the bossfight.
Anyway, I enjoyed playing it!