Well done, needs a little polish though.
Nice intro, nice idea, nice graphics, nice plot. Decent sound and controls. The ape could have used some foot-step noises (but not so loud/obvious that they're annoying, but its a missing detail), and the enemies were a bit, silent, as well as when your character took damage. I know he is a hard-ass, but he should at least grunt or show some sign of being hurt. And the music, while good, needed more variety: it got old. I think maybe a little metal might be more fitting ;-). The WASD movement and mouse aiming, were absolutely excellent. But the clicking a button to reload? Awful, just destroyed the flow of the game. Now, I understand maybe you intended for it to be like that to take the player's concentration off of aiming, then fine, but at least make it so that the character doesn't fire their weapon when you click reload. My recommendation, however, would be to hotkey reloading to "R," but make reloading take a few moments so that its not too easy. That way the player can still focus on your neat visuals and taking advantage of cover while blowing guys away. It keeps the pace up. Otherwise, the game is as simple as "hide behind object, peek out to kill stuff, reload, repeat." But beyond those critiques, this was a well executed, simple yet effective idea for a game. With a little polish this game could be really great. Maybe extend it a bit too like others have recommended, and using numbers to switch weapons would be a nice touch too. If you wanted to really get the game smokin, you could try making the cover system more akin to Gears of War, so that the character can actually latch onto cover, peak out and aim, and the enemies lay down supressing fire. I understand this would be perhaps a very different game from the one you intended, but I think in the end it might be a bit more enjoyable, having more complex gameplay. As of right now, your game is enjoyable, but too simple to really shine. I recommend you go for a sequel using this same idea and principles, but spend a little extra time creating a more complex system. Graphically, you did great, but visible bazooka rounds and effects for the bullets hitting things (besides enemies) would be desirable. The moving arms however, was a great detail, and came out very smooth. So, the controls and small sound goobers aside, great job. Also, I love the little touch of "Good Night" written on the back of the Bazukas, haha. I hope to see a great sequel out of this, hopefully with more complex gameplay ;-). Good luck, nice job, and keep at it.
