Spuju; Balancing; Gameplay changes;

Muju upgrades decrease cost of summoning things by 1.
Burst affects Muju.
Speed is more variable in minions.
Ghost player lerp is more slow.
Spuju spawn rate starts early and slowly increases to max.
Juju uses a sub-1 polynomial to control scaling, but has a higher
starting value.
Enemy min rate was lowered.
If there are no enemies on the screen, the next enemy timer accelerates.
Fixed muting.
Renamed SpiritBomb to Spuju -- Spujus fire Spirit Bombs now.