-Last upgrades are too long to get...
-At high speed, buildings come too late on the screen, so you don't have the time to think about what to do, it's as luck...
-First 250 points become really boring...
-Hit box of the ship is not really good, my wings often touch obstacles and I don't take any damage.
-I like those graphisms!
-Music sounds good with this concept of game.
-You should create more different obstacles, and also moving obstacles.
I find that you don't really have finished your game :)