Interesting idea for a game (having it so that each npc has two upgrades they could provide, and so that upgrade combinations can allow the player to enter different areas) It took me a while to realize that you could hold the button to send out multiple projectiles, which made the wall projectiles a lot more useful.
Music is a little loud at the moment, but I'm impressed by anyone who can make their own art and sound assets. The sprites were kinda cute in how they would fly into the air or float to the bottom of the screen, with little speech text.
Clickteam Fusion...wasn't that the engine that the FNAF games used?
Overall, great job on the game, even if it is more of a prototype.