We are a small team, so mail arrives at a person rather than a queue. There is no ticket number and no form that swallows what you wrote.
Ideas and bugs have somewhere to go that isn't an inbox: a list everybody signed in can read, vote on and reply to. If somebody has already asked for the thing you were about to write about, an upvote counts for more than a second email.
The board is behind sign-in — what is on it carries people's names, so it isn't a page for a stranger to read.
Which screen, which phone or browser, what you expected, and what happened instead. A screenshot beats a paragraph.
A thing your year does that this app can't keep up with yet. The requests board is the better door for these — somebody may have asked already.
A copy of it, a correction, or all of it erased. You can do the first and the last yourself from Settings — ask and it gets done either way.
Sign-in goes through Google and occasionally comes back with nothing useful. Say which address you used and roughly when.
Settings → Your data exports every year as one file, and reads one back into any account. Both are buttons, not requests.
The same page erases all of it in two clicks. You don't need me for that, though you're welcome to ask.