Thank you for the feedback! I really appreciate it. A couple of these things I admit that I must have just gotten used to during development, but I can see how helpful it would be to add these improvements.
For the ball speed however, it's a feature not a bug 😄 the ball speeds up as you get closer to finishing the level, and sometimes a power-up will increase the speed; just to make things interesting (and inspired by space invaders). I was thinking of having a speed multiplier in the settings, which could be analogous to difficulty.
As for the slider, yeah I believe it's another classic Unity flaw, lol. I'll look into it though.
Thanks again, I'm glad you liked it!