What about customs?

Leaf is not interested in those. Only matchmade games.

Feedback? Bugs?

The GitHub will handle it all.

What about my full match history?

The current iteration of an unofficial API can only go 100 games in the past. Leaf records these, so visit often to keep the database growing of your older games.

My stats won't work!

You are probably not sharing match made stats. Check the Accessibility tab.