Ok. The game looked good at first, but the game play is horrible.
All the enemies are moving very smoothly. But the players nanobot just hops from one point to another. I guess you use some kind of grid for the players position, right ? you should drastically increase the resolution of that grid.
Next, the messages at the beginning of each level should stay for at least double the time. I had to kill myself twice at each level to read all the information.
What system do you use to calculate the amount of stars gained at each level ?
I guess something like Passed level (1), no damage at health (2) and no damage at all (3). You should explain that to the player so we can keep an eye on this facts while playing a level.
for me: First level 3 stars - all the other just 1; and i don't know why i didn't got more.
All in all, the game was playable and i discovered no bugs so far. But please try to further improve your game. 3.5/5