Short and sweet is how a game like this should be.
In total agreement with JerrodStorm; the only minor issue would be in the speed and movement of the bytes. They seemed a little slow and lacked inertial qualities which are present in the ship's movements.
It seems that the implementation of the replays was primarily focused towards "new players." If you're an avid space shooter player you'll come to understand that there are really only two things to focus on: #1) maneuverability and #2) firepower strength.
I only took maybe 2 hits the first three levels; at which point I had one or two upgrades into the ship speed. After that, with practice at games like these, you should be able to avoid 95% of the attacks taking place.
From there it was smooth sailing; went through the whole campaign never taking more than 40% hull damage (and only because I was greedy on the last few boss battles and wanted the bytes where all the action was taking place).