Thanks for the feedback first and for taking the time to play the demo. Shufflepuck Cafe is definately an inspiration for this game and if I get anywhere near that game's quality it will be an acheivement.
This is the first demo for my game and I agree with what you said that it is missing a lot of usability options (and more). But I've just added what you mentioned to my to-do list (display / audio config, and either a control binding / prompts). I also agree with the score UI, it looks a rough and does take too long time to 'total up' towards the end of the match. I'll think of a way to speed that up, perhaps score the opponent's then the player's in groups