I vote for infinite-life coin bags and some sort of knockback being done to the foes who get whacked, to compensate for the moving forward with an attack and walking through people thing.
I'm getting a problem when I try to buy a level 1 booster with more than 200 gold and it says I have insufficient crystals money etc. So my question is whether this is part of the game or it's a glitch. +1 so the DEVS can see this.