I think metallica is a really fun game with the current code, but and here comes the but, I think its stupid that every time you hit the mystery hole it always gives you 500k.
I hope they add more then 3 or 4 options to the mystery award on future updates.
What would be cool is if the mystery awarded you songs that you can only hear by hitting the mystery shot.
Even better would be if you could keep the ball in play for the whole song and be awarded like 20mil or some large sum of points, and before someone says that they will just cradle the ball for the entire song, make it so that you have to be hitting switches every 10 seconds or so to keep the song mode going.
I also wish sparky electrocution modes were more progressive on points, the more you hit him the more points you rack up.