I like that the drills don't just automatically become better the more expensive they are. Each one has its own purpose and strengths, and depending on what you're aiming for in the run, you have to choose which drill will help you the most. Good customization with some annoying grinding and lag issues.
There are some nice new features here, but why did you have to go and change all of the things that were fine the way they were? If it ain't broke, don't fix it.
The problem with the hard badge is that it's based on probability. You have to get yellow madness pretty early along with a solid amount of purples all along the way before you're ever going to get near 5 mil. You could get it on the first try, or you may have to restart 100 times.
I think the powerups fly away too fast after you beat a level. Often those powerups are needed to beat harder levels. And they're very necessary to beat the game on hard. Please don't make them leave the screen so fast.
This game has potential, but the controls are so poorly made that they make the whole experience frustrating. Basically just a cheap knock-off of Super Smash Bros. I really have no idea why this game ended up getting badges.