I'm not an expert game reviewer...
But I will rate this game like one.
For those of us who know astronomy, the title is actually creative, A Blue Shift is an object moving through space at high speed. That brings me to my next point, I found the game play too fast paced.
Now here are my Pros and Cons:
Pros:
Very creative with the weapons
The EMP is very good for getting out of a jam
A lot of hard work went into the graphics
The game became addictive after a few play troughs
Once you've leveled up your weapons, the game really isn't that hard, but its still hard
The health powerup was a lifesaver literally it recharged like 3 bars
Cons:
The shield lasted a very short time
The repetitive "ping"-ing sounds were very annoying
The EMP was very hard to charge without dying first
The enemies' weapons never varied
The save feature didn't save your last checkpoint
Some levels had no checkpoints
The Mini-Boss (the red one) was always the same
The animations for the death of a boss were very well planned, however, I had no other Applications running and my CPU went from 10 to 100, causing the game to lag.
I hope my review helps you, this is a very creative game but it needs fine tuning.