Am I training correctly? Plus, are there more interesting games?

I just got my device in and want to make sure I understand how this device is trained with. From what I understand, I need to just breathe and try to focus (on red dot, I guess...? If not that, then what?) and ideally my score should go up in time?

I've seen the word "ratio" used here, and how that should be going up, as well. What exactly does that correlate to?

Also, is there a way to get more interesting games set up to be used with this device?

Thanks!