[Unknown] [unknown] A game with species of blue, green and yellow monsters that were liquidy, and they had minions of their species that you summoned to defeat the enemies and you played as one of the monster species.
The plot was that the monsters all lived in peace, and battled each other for fun, but then some aliens stated invading and colonising their planet, and the mastermind was this little imp alien, and one of the last boss battles was an old grandpa boss, with a huge healthbar, but then he just dies because he's old and the imp gets mad at us because the grandpa was going to make him a girlfriend (or something) and he gets a girlfriend in the ending, but she's weird and mutated.
Thank you if you find it!