I didn't understand this game at all. One of its biggest weaknesses was how it had no sound or music. Another was that it was just too bland. I imagine that you were trying to make something impressive with the 3D, but it didn't come out very well. There needed to be a lot more variety. I got some goals, but don't even remember when I did.
There are just so many better games out there, this doesn't come off as anything special. You should have something more imaginative. Sound/music does a good job of making a game more interactive. You just don't have the feeling you're there. Of course, virtual reality is now unpopular.