works perfectly and looks really pretty

Well, Proton team done it again. Switching to all Proton services for privacy concerns, I'd strongly recommend you to check out other applications and services they made. Keep up the good work team!

The sharing functionality could be more useful - I cannot see some fields (TOTP, custom fields, etc) in items shared to me by a paid user unless I am also a paid user. Otherwise it works great and is a solid privacy-respecting password manager!

A few features are missing compared to Firefox's native password manager. The most relevant ones for me are a) keyboard shortcuts, and b) credential fields that are more than email-password pairs (e.g. AWS login that requires an Account ID, IAM Username, and Password)