I'm gonna say it now, THOSE RED BLOBS IN THE CASTLE ARE N̸̛̬͔͎͐́͆O̷̹̗͉̹͂͐̊̑͝T̶̤̍ ̷̱̗͈̆̇͘̕͘͜B̷̥̑͂̀͛̓̈L̵̢̟̰͉̮̋̉͂̈̏̊Ŏ̵͔̥̪͍̼͇̀O̵̗̝̲̅̇̅͒̽͝D̷͕̻̮̥̺̟̊̅̌̓͋͠. Normally corruption is purple, but the main antagonist managed to split it into blue and red corruption. There, that's what it is.
Based off Kirby games made by Hal Labs