With your permission, I will not describe what other users have already written before. But I have my own comments:
1. When I connected Metamask and logged in, a notification is immediately displayed that my balance has been replenished by 25 busd
So whether I have viewed this notification or not, it still displays a red dot as an indicator that I have not read the notification. Need a "mark as read" button!

2. Let's go to the
https://app.zen.land/settings/profile page.
1) I can set the profile name as bitcointalk_manager or pornhub_owner. This opens up quite a lot of sorts of different phishing options. Look at how much scam there is in the telegram because of this. Make it possible to change the profile name with some serious restrictions, or information in the profile of another user about when he last changed the profile name and in general how many times he did it.
2) I found that I can't set the profile name in Cyrillic. I haven't tried it, but I assume that it won't work to use other languages that don't use the Latin alphabet. It would be great if there was such an opportunity.
3) As it turned out, each field also has a limit on the number of characters. Why not warn about this in advance? Maybe I wanted to write something about myself in verse form, but in the end I received a warning only when I had almost finished the poem.
4) And allow user to connect an image for profile from NFT. It's such a hype, so if you're on trend, it will only benefit you.
3. Ok, let's move on to creating a contract.
1) Again, why does the warning about the number of characters in the "contact name" field appear only after I click the "create" button?
2) Got the error "a valid integer is required".

Accordingly, there is needed hint where it would say which values are valid for this field.
3) For some reason, it is impossible to set the amount with a comma. That is, it turns out that it will already be problematic to send $ 100.5
4. When the transaction is completed, I can leave a review, but please add technical information to the reviews about which network the transaction was on and for what amount. After all, using test networks or just small transactions in the main networks, it is possible for scammers to grow up the rating with the help of their own wallets.
Otherwise, there were no problems. Almost everything is intuitive and easy to use.