Thanks!
Did you go and talk to grandpa? He has one first aid kit for you after you recruit 2 monsters :)
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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 ^^