Reminds me of what an early build of Starfox would look like, good job! Simplistic controls, and simplistic gameplay, yet just the right amount of challenge. the first world was the perfect amount of difficulty to ease the player into the world. would love to see hordes of enemies fill the screen as you have to dodge them.
I enjoyed the camera shifting when the earth got higher and lower, as well as enjoyed the 3D styled overworld map. you could have a real classic on your hands here.
Needs Sound!