A lot of people have already posted good feedback regarding the camera and pistol rate of fire, which I second. The graphics were nice, and I liked the pistol firing effect. The game would definietly benefit from additional checkpoints or health packs.
Unfortunatly the game bugged out for me at the end and I was unable to view the ending, so that might be something to look into.
You have a good base here, should you choose to improve on it.