Nice shooter! It's not the type of game I typically play but I did enjoy playing through it. You have a nice variety of enemy attacks and the game looks good overall. Two points id like to make though, as NeatGames mentioned, holding right click the entire time does get a bit tiresome, maybe the gun could always aim towards the mouse cursors global position eliminating the need to aim all together, unless that is a mechanic which you designed for a purpose, in which case do nothing about it. Additionally, I felt that there were a few areas that were empty aside from props, these locations could use some enemies for more constant action. All in All very nice work!