Do not buy this for your kid. It has cuss words like FUCK. Couldn’t believe it when I saw it pop up. I thought this was for kids. But no definitely not.
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You should read game descriptions before buying them as they usually have important information. For example, in this game's description, it was written "Despite the cartoony graphics this game has some elements of body horror, blood and other themes that are not considered for a child." That's the second sentence written there by the developer.
Small indie games, especially from one-person teams, don't often get ratings like you're used to seeing with big studios/publishers. That's why there are often warnings about what content to expect in a game. You could argue that a lot of the things in a lot of games don't add anything to them. It's all down to design choice.