Thank you for the feedback, Anon Judge! There is a small settings/volume menu in the top left part of the screen.
I agree with the feedback about making level up screen faster - I've noticed that some players press ESC to close levelup window - and it causes them to exit fullscreen mode on the web export build. That could definitely be improved.
Level ups are indeed disruptive to the gameplay. I think the talent window should not popup by itself, only by player input. The same with closing. I'll change that behavior after the judgement period ends.