Fixed the SFX issue and some more

This small release fixes some of the bugs that were still in the GameJam version. Specifically, the SFX missing in the web build and the missing UI when not in full screen. Both of these are now fixed.

Another feature that is now implemented is the indefinite scrolling Asteroids. So you will never run out of asteroids.

Anyway, still far from a full game, but at least better :-)