Update 4: Hell Mode! — Null Vector Steam update #70934

Update 4 adds a new, much more difficult game mode called Hell Mode. The mode changes all enemies (including the boss) to make them significantly more deadly and includes 7 new music tracks by Adam Alake. The new mode is unlocked after all 5 of the current Modifiers have been unlocked (but not necessarily enabled). This mode is the way I always envisioned Null Vector. It's hard, and with all of the current modifiers enabled it absolutely kicks my ass... Which is awesome. There have also been a few balance tweaks to the weapons. The biggest change is Rockets now explode once per level when combined with Piercing or Ricochet. This means Rocket + (Ricochet or Pierce) explodes once, and then the projectile converts back into a standard bullet. Upgrading Rocket to Rocket II would explode on both the first impact as well as the final impact. This reduces the previous OP nature of the Rocket pa...