0.6.4 Balance changes and hotfix

0.6.4

Hopefully fixed a bug where the orb spawning enemies (that start spawning on wave 24) sometimes became unkillable, softlocking your game.

Buffed heavy armor A LOT.

Buffed potassium nitrate and infernal shard a lot too (just not as much).

Buffed the orb spawning enemy a lot too so it deals more damage and has more health.