You can play it on a browser, but it still a real game with lots of features. The graphics look great with the 3D modelled ships and the nice backgrounds. You get to choose from multiple ships and there are different levels too. The levels themselves are interesting, with different types of enemy ships bringing variety. I have no experience with Unity's WebGL, but I suppose that the game saves really work, which is another cool feature.
If you're interested, you'd be very welcome to enter our contest, the Game Development World Championship!