overall a nice game
The game play mechanics are sound, the sound and graphics are decent enough.
Yes, it's easy to get money and upgrades (maybe make more possible upgrades that are less powerful and/or more expensive) and yes to get A+ on all levels is an exercise in patience, not skill. Level 28 is nigh impossible, I tried it so often that now I have 9607 credits and full upgrades on everything.
The "new skin" is only a differently coloured (light orange) ball.
Felt a bit let down about this...