I wish there was an easy way to add shadowing and light effects than with different colors. I had such a hard time finding the right colors for one avatar I made that i ended up using just whatever I could find that was remotely close to what I wanted.
Maybe more customizable upgrades could be added and make the ship have more levels. There is a glitch where you keep your ship look and size when you hit retry
There are times where you have no where to go. Also sometimes you will get a chance to come back after falling other times you won't. It's not a unique concept either.
You need to make your enemy celles less random. One time the first celle i hit was a 4 piece with a missile core then i got nothing but one piecers and a 7 piece with bombs until the 1st boss.
Gray level is not a variable. You are the first to bring up such an idea as level effecting your rank but many many people have supported and confirmed what i am saying.
Ranking goes by score witch is developed from the points you get on the level x accuracy x repel x 10. The points you get depend on how long the arrow is in the air.