You're right that please and thank you could come off as sarcastic or a bit odd in a comment section like this. The best route is probably to clarify that it s

You're right that please and thank you could come off as sarcastic or a bit odd in a comment section like this. The best route is probably to clarify that it seems like a good concept, and you think that adding x and y would be the best features to focus on that would make it even better.