The game is interesting, it was quite enjoyable although very difficult (at least for me). Nice job for a first game (it was much better than mine haha) - I understood what I had to do, the controls were easy enough to use, and the obstacles were intuitive enough to navigate (I already knew having not played the game, to avoid the security for example).
Some music would be nice, you don't have to make it of course just some assets you can find (and legally use). And perhaps a tutorial area/make the first guy easy to kill just to allow for some progression.
While this game has lots of potential to be better, congratulations on an enjoyable, cohesive game!