v 0.04 Released

**Changelog**

1.  Added Level 8.
2. Added secret rooms/shortcuts to levels that needed them.  If you don't have the Thunder Cannon (as in Level 1 and possibly up to Level 5 if you're not looking) the only other way to destroy shield walls is with enemy fire. It wasn't very elegant when I tried it but it does work.)

Next update will focus on replacing the terrible "BOOM" sound that occurs every time an enemy projectile strikes an object, as well as additional levels.