It's always neat to see a clicker game where your purchases have an immediate impact on what you're clicking. I like how fast things escalate! Since you've mentioned customization for a possible future update, maybe you can offer different upgrade paths to change up how the slimes look and what the player does with them?
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Now that you mentioned it, I now thought about a prestige for this game inspired by the [Shark Game](https://cirri.al/sharks/)