As others have said: it’s too expensive.
This is one of the few apps I would actually be prepared to pay for, because my son is already having fun with the free level. It’s well made, it looks exactly like the physical toy sets you can buy, and it’s educational.
But 35 euro’s is already pretty steep. And if it’s a yearly subscription and only works on 1 family members device, then that’s a deal breaker. Change the subscription to a ‘season pass’ style one-time unlock, and I’m in. That way, you can ask 35 bucks every year for 10 new levels every year.