I liked it the upgrading stuff and shooting stuff. Things to make it better. It felt like on like wave 5 there wasn't nearly enough enemies to shoot and I was one shooting all of them. It could use knowing how much you stats are on damage. Your player could also have more then one HP. 

Adding the mouse left and right click to control because I didn't know how to play at first. 

Hey, good work! Game worked fine on my PC and I played through (i think) all the available waves. It got a bit too easy and I eventually let myself lose since I wasn't sure if there was an end to the game or not. But overall, great job making a game!! Oh one thing - I wish I didn't have to hold down right-click to aim!