Please make your Safari extension also available on Apple's Safari Extension Gallery (https://safari-extensions.apple.com). The advantage of having it there is that it updates automatically and it gives extra peace of mind knowing that it passed Apple's standards. The extension of your main competitor is. You should definitely add yours too. To be honest, I only use Safari extensions that are on Apple's Safari Extension Gallery, for the reasons I just pointed out. Edit: Never mind. I just noticed it is there. For some reason they first time I search for Enpass in the Safari Extension
You should add iCloud sync for Windows computers. iCloud is available for Windows and you can save and sync any files to the cloud, like you do with the other more common cloud servers. I do not like Dropbox, Box, Google Drive, etc. Please consider adding iCloud sync to Windows. Thanks.