Excellent remake, but...
First, I loved IndestructoTank 1 and 2. So much fun, and A.E. does not disappoint. The improved graphics are great and the gameplay is still addictive. The standard mode is devilishly hard, making it a good challenge.
But... the gameplay seems to have been tinkered with, and the result leads to less predictability of the spinning of the tank after explosions and making missing much easier. Also, the overkill of planes in the upper levels made the job quite a bit harder. (I know, I know, you DON'T have to upgrade, but it's pretty easy to think you have enough to max out when you don't!)
So if you thought 1 &2 were too easy, and you want a challenge, A.E. is for you. Fun!