Can i use assets in my game for Google play?

Can I use the unity technologies and another free assets in my game for Google play?

I’d like to know about unity technologies mainly, but most other scripts have licensing included that you Must include in your build for it to be legal to use. its your proof of purchase.

I don’t think there is any problem. Check if the assets you are using are Copyright free material, and you can use them for your project. Some assets requires credits (in a credits screen for example) and others forbid you from using them for commercial projects. Just make sure to check every asset.