I think my skill in this game has improved as I play, and would improve more if I continued. It's a challenging arcadey game. At the start, I didn't understand all of the mechanics, such as how the guards noticed you only when facing you, and how the scientists replenished your health (edit: the tutorial was ignored...).
Like JUSTCAMH said, I kept trying to use the arrow keys to move left and right. It would be fine if I built muscle memory, but it was just difficult as my first time playing.
The pace was definitely frantic, and I might have appreciated a couple more lives, as long as it doesn't make it too easy. I would be less paranoid about dying and more focused on the offensive.
Different difficulties might be interesting, changing the spawn rate, damage dealt, and life count.
Unfortunately, I haven't gotten to the boss, but I'll have to try later when I have more time :)
The audio and graphics both worked really well.
Awesome submission!
-Zachary