Thank you for that comment. If many people like the idea of the upgrade system I am planning on rebuilding the game in Godot as a longer and more serious project. Unity seems to be a bit limitating when it comes to creating dynamic UI-Systems. Unfortunetaly two scripts of the game broke for no reason when I made the OpenGL build in Unity, meanwhile the game works completely fine in the engine itself. Propably the time has come to leave Unity behind.