A significant patch to tidy up some things and moderate difficulty.
+Increased enemy spawn times by (generally) 25%.
+Limited the number of enemies a spawner can create, avoiding enemy mobs.
+Shooting grenades no longer causes them to explode.
+Fixed a bug where players could not unlock new single-player levels when playing with invincibility turned on.
+Minimum difficulty level on single player is now 1 instead of 0.
+Fixed a bug where single-player difficulty settings were bumped up after the first time playing the game if players had not manually set them.
+Multiplayer settings default to the easy ("Thug") settings to simplify for new players.
+Added a reference color wheel when the game is paused.
+Fixed a bug with loading custom difficulty settings to prevent score miscalculation on Checkpoint Frequency and Number of Lives.
+Fixed a bug where players would see characters stutter between the falling and standing animations when standing on the very edge of colored platforms.
+Explosives no longer damage the boss when in his final, white phase.
+Fixed the fade-in titles to show the correct number (1-X) for the 4-player version of 1-4 and 1-5.
+Set more challenging time limits on the single-player levels.
+Various level adjustments.