Good start.
But you have a ways to go yet.
We have quite a number of games like this, so you've gotta come up with something that sets yours apart;
(I appreciate this is a demo, and that most of the ideas will have occured to you)
*Weapons. Whether direct attacking ones, or distracting ones
*Little bit faster? The agent tended to plod along in my opinion.
*Choices; say with the path branching off, having one more stealth heavy, the other more action heavy.
It's a solid start (Good graphics by the way), but you've gotta read all the reviews carefully, and figure out what's best for the game.
Look forward to the final version.