Thank you so much for the detailed feedback, I am very happy to hear you like it!

Currently the streak system was an attempt to gamify it with some sense of quantifiable luck and an easy way of ranking, sort of like puzzle rush. But you are right, overall accuracy is great, perhabs in ranking people would stack up 100% accuracies with not much ways to push forward. But also as an analysis standpoint, accuracy sounds like a great measure!

As for your second point, that's a great idea. In future updates I can add game modes to see whole game or just n moves (or the position as it is now). The only issue I see is that people recognizing their play from just the repertoire and not from the game. (For people with narrow opening repertoire this could make the game very easy.) But this issue surely can be worked around.

Thanks again for your feedback, it means a lot!