Retro Calculator | 100 days design challenge

This is a contribution to the 100-day design challenge, where we get to try to stick with a time limit of 30 minutes. For the subject of the "Calculator" mobile application, I decided to go with the retro calculators which I used to have in the old times. I used some of my old assets to create this concept (and I could not help myself and not put more effort to make it even cooler😬).

Which style do you think is the best?

I'd like to hear your idea on the outcome.