@fribbledom To me the compliment have to be somwhat specific. Positive like "it's great thanks" doesn't mean much. It's smalltalk ?
Report a bug or suggest something while you are at it. Never ask for something, just give something. Use the occasion to be constructive.
You could also make some small inspiring story. Or attach some drawing you did. Submit a song. Fanart. Your implementation of the software. A meme. Anything that is not "words throw away in 5min" is great. Or money.