A sell system would make no difference to me, but it would be nice to fix the face shop if you can't afford it and you leave with out confirming than you have to go through the tutorial again unless you have a full team then you have to restart the page, and the ability to restart would convenient.
You use steal dna option when you have lost in evolution witch will copy the army you lost to so you can post them online, so anyone can use them including you.
The trick to level 25 is the paddle depending on were the ball hits the paddle changes the direction. for example if the ball lands on the right side of the paddle it goes right so left is left middle is middle. the answer is get it in the middle and don't move the mouse then wait till you win.