the new system has scores and badges in the same window, which you can normally switch. If it starts on scores and doesn't say "see badges" there are none
Good but gets repetitive really quick. maybe if like you threw in an actual boss every 10-15 levels, and if certain enemies gave more points, since it takes a while to stack up. Other than that, pretty good.
I found the easiest way to get the big ones is to just go out in one direction once you beat the boss. especially if you have a fast tank (anywhere towards the middle level) and just run til U find it