Last mon always gets me ! Maybe I should change tactics...
Nice game, though! Simple but interesting gameplay and very cute art )
I found that the best tactic for me was recruiting Toxy the snake/worm thingy first, and using it once at the start of each battle (because poison is maybe a little bit too strong haha).
After that get Gooee as she deals the most damage and spam her attack, basically. She’ll make short work of pretty much everyone else ^^