A couple of comments right out of the gate on the UX/UI:
- Why is the place where you create and browse projects called the "package manager"? I opened that expecting to find plug-ins or similar. (Might just be a language barrier issue.) "Projects view" or similar would be a better term.
- The window-centric design aesthetic is quite unwelcoming to new users, especially if you have to start by opening some specific subset of the windows. Prefer some automated layouts, and preferably some kind of way to snap windows into panels photoshop-style.
- If you are going to stick with a windows-first aesthetic, it's important that those windows behave as ergonomically as possible. For example, if I click within a window, that window should come to the front if multiple windows overlap.
Best of luck with continued development!