-added more difficulty to the tank invasion challenge

-fixed on the challenge the tanks being spawned only on 2 corners instead of all 4 corners

-added a new boss and a custom challenge around the new boss

-increased a little the volume of the space invasion music

-just a small fix for the missile sound effect

-fixed a rare bug that makes mecha sonic continue shooting freezing missiles if the player is already frozen

-decreased the volume of the music of enuo
-updated description

-improved the meltdown attack of enuo

-added 2 new bosses

-fixed the space invasion item still appearing outside the starting room of dark room/chest