v0.2

The second update to this experimental game, the changes listed below:

- The shooter enemies now can be spawned with either the energy submachine gun or the plasma burst gun, but never both. Still, watch out!

- Tweaked the stats of the projectiles that shoot from the player, the shooter enemies and the turrets.
- Fixed the moving boxes that cause the extreme lags.

- Last but not least, some changes had been done on the whole map design, for improving the gameplay experience and balancing.

Have fun!