The overall game is quite well done (nice graphics and music) despise some major issues you should fix ASAP (the screen size stuff).
However you need to change a lot of stuff in the gameplay if you want to have 5 stars. And I'm insisting cause I know you can. Problem is that people are gonna harsh on you since you copied a lot of games already on newgrounds. You need to do better than those games.
Here are a few ideas:
-achievements!
-story
-gold bonus for height or flight duration. There is no challenge here when playing, it's just about gathering gold to buy upgrades untill you can beat the game. The lack of gold bonus doesn't push the player to go higher during the beginning/middle of thhe game.