That's tough. It's rarely a good idea to ask these questions so late into development. Your marketing plans should be a factor when designing/developing it.
For example, if you want to target this game to kids, you
might run into some issues with approachability. In your video, I saw a lot of menu options with lots text at ~0:28, which could turn away a lot of younger players that would be intimidated by all the text. If you look at Mario Maker, the UI and entire building system is super approachable to players of all ages and skill levels. Even preschool-age children could have fun playing that.
With that said, your game and art style remind me of my times in the gamemaker community when I was around 10-12 years old. So without any market research to back it up, my nostalgia/personal experiences tell me that you should market this towards 10-12 year olds