How exactly to we enter words into this Crypto Platz Metal Card?
If this is done only with your app in digital form with encryption, that means we probably can't recover seed words in any other way, so I see this a single point of failure.
I like that stainless steel is used, but I personally prefer entering seed words directly in physical form with engraving, and I think there are other cards that work in similar way like yours.
Current price of $100 is to high for me, until I see some stress testing and code review.