I like the concept - it definitely feels like being a gunner in the Millenium Falcom or something similar. The gameplay itself could use some polish though and I think your audio is broken? (might just be my Firewall or something).
Either way, very impressive work in just 2 days! I can also tell you most likely created the 3D models in Unity, which I know can be quite a hassle. If you want to publish this as a stand-alone game I'd suggest going for a first person viewpoint - that could improve the fantasy of being a space gunner even more.