Buy an app despite Minecraft?

I recently saw an app for 5 euro that is similar to Minecraft. I also have an Apple voucher with enough money to buy this app. However, I already have Minecraft on my phone. Some find it unnecessary but I think the alternative is simply simpler and clearer. How do you see it?

Personally, I find the free Minecraft replicas quite amusing and refreshing. It's nice to see what alternatives can be created based on Minecraft. And there were really nice and good ones too.

But nowadays they are just looking for money to copy. The 5 euro is not worth it.