As someone else mentioned, I also had a little trouble understanding what the best thing to eat was. The art was great though, and it feels like you had a lot of fun making it.
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You should give them food until they are happy (see the emoji on their head) and the type of food that counters the enemy's beam (salt beats sweet, acid beats salt, etc). And every monster has a food they like the most.
Thanks for the review, it was a rough development with ill people and people having to leave but fun never the less.