Decent, but could be better
I liked the premise of this game, and it is clear that you worked very hard on it. I enjoyed it as well. However, I noticed a few glaring problems/errors.
The icon for the Steyr TMP is incorrect. The picture shows an MP5, not a TMP. You got the icons for the other weapons correct, nonetheless. In addition, as many other people have stated, the reload times are unreasonably long. Only for the Mossberg 500 would such a time be acceptable, as one must insert each shell. For the Glock 19c and the Steyr TMP, there is really no way a trained professional, or anyone who has ever seen a gun before, for the matter, could take that long to reload. I understand that you wanted to add some tension and difficulty to the game, but there are other ways to do so (e.g. give the player a very limited amount of magazines, forcing him to make each shot count.) You could also have the player be forced to refill a set number of mags with rounds from a general ammo pile (e.g. you get 5 20-round pistol mags, and you can buy ammo in reserve, but you have to drag-and-drop the mag icons unto the ammo pile for them to be filled by a helper when they are empty). Of course, this is purely a suggestion, and I am sure you can think of something better.
The character's movement speed is also a bit too slow. If there was some sort of explanation for this (that he is wounded or injured, etc.) then I am sure that it would be better accepted. Finally, some melee weapons would be a nice addition for the times when you are caught with all your mags dry. It doesn't have to be anything elaborate; just a combat knife, blunt object, or any other implement that does not push one's sense of disbelief too far would be good... unless you decide to include some easter eggs, which would be quite nice.
Overall, I think that you did an excellent job on this, and I hope that you'll take some of these things into account in the sequel. I am looking forward to playing it.