Nice relaxing simple game :) It definitely does use the theme but it's not exactly tied into the gameplay in any interesting way. But it's cute.
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There definitely are a lot of that lol, but it's nice when someone can do something unique but having only one thing is integral to the gameplay. Like another person has said, you could replace the other slime with a goal flag and it would be the same thing. Perhaps that's something to think about, and it'll help you in the future :)