Your submission page looked very good and professional! I like the 3d aspects of the game and I think I stared at the sun too long. Took me a little bit to figure out you had to shoot the diamond to start a wave off and that the spheres came from above! I didnt really move around much, just aimed and shot the red things. Maybe giving a reason to explore the arena would add depth. Adding music and sound also would help a lot for the game experience.
I havent tried 3d yet, looks difficult to do! Impressive visuals