This game was really good. The movement, acceleration and deceleration all felt good. Sound effects were good. If there was BG music it was too quiet (or my kids were too loud). Simple shapes, art and colors allow for good readability. Same can be said for the explosions. Upgrade system felt nice, could be simplified for the "average gamer", the example of this is the health of the ship being called integrity. That term did not directly make me think of my ships health when i seen the upgrade.
Great game. I enjoyed it.