This is great work. At first, I thought the game mechanics were too difficult. I spent a lot of time failing on Level 1. But after few minutes of playing, the mechanics became easier and easier to control. I completed all 5 levels in about 15 minutes or so with the most time spent on Level 1. The fact the game feels like it is getting easier while the levels are getting more complex is very rewarding for a player. If you ever introduce a "hard mode", consider a limited fuel supply and the player could approach the levels like a puzzle.
For the art, I think the maze structure is the biggest weakness. Since it is the what the player is looking at the most, it would benefit if there was a little more detail. All the other assets, the ship, asteroid, lasers, and turrets are all top notch in my book.
While the music and sound effects are good. I would prefer if either the game was not so loud or if I had the option to turn down the volume. I think I had to turn my system volume down to about 25-30%. The music is a little pitchy (a lot of high notes) and may have been a little overpowering compared to the sound effects.
Overall, I think this is great game and gives a lot of credit to physics-based games.