Super cool!! The graphics are absolutely amazing and it says you made them yourself.... INSANE! I love these survival type games and this one is no exception. It's so fun to explore and see what you can find.
One small improvement is that I wish there was a crosshair or some way to tell when you were hovering above items, as it was a bit hard to line it up. More volume and, as mentioned in the previous comment, audio cues would also be great was well.
Overall, for your first Unity first-person game, this is amazing! While a little rough and unpolished on the edges, you clearly have amazing potential for a 3D develeoper, really nice job!