Playing the game on the easiest mode I still cannot pass the second stage. Too many enemy planes for the second stage in my opinion, they just keep coming forcing you to change to rockets and making destroying ground targets almost impossible to take out due to a control issue with the diving.
Also the colisions with enemy planes are frustrating I am sure this didn't happen in the original.
Much respect to the dev team, lovin' the remake ;)
You need to play more! We are doing just fine even on medium;) Now seriously: level 2 is to show you the hardest dogfight. We didn't want you to pass the demo within 5 minutes. This is arcade game. Still I promise that the game will be much easier (at least on 'easy')
Finished the second stage, some more suggestions would be speed which the ground troops run and also the speed in which they rebuild the ground guns. If these could be slowed down a notch it could make the game more balanced.