First concern is the Topbar, when using full screen interfaces, it’s best to enable “IgnoreGuiInset” on the screen gui and disable the Topbar or make the transparency of the Topbar 0.
Second is the password box, if you want to give off a more realistic feel, make the characters turn into circles/asterisks and perhaps add a button to show or hide the characters of the password. Also make the login button turn red when denied.
Third is the menu after logging in, the buttons are stacked in a strange way… perhaps group them in a logical order rather than just throwing them in shaped like a tree.
Fourth is the username box, I think most games who have this kind of feature where you type in the username is a big mistake, there should be an autocomplete system or perhaps when the text box is focused, show a list of active players.
Fifth, it’s overall a professional design, I like how navigation is right in front of you, it’s just a matter of clicks when getting somewhere, but I’d like better instructions when I’ve submitted a segment like “Proceed to … “ or you could remove the side navigation all in all and add a “next” and “previous” button at the bottom of the screen and when the report is complete, there’s a “create new report”.
Another thing I’ve noticed is the excessive use of text boxes, you really don’t need a text box for gender, just create a drop down list and try to apply this in other areas.