Hey there! Yes, I did a big portion of it in C++. I had to roll back to GDscript for many things because integrating with third party addons (such as DialogueManager) was difficult. It is possible, as it mostly interacts with a singleton (Autoload), but in the end wasn't completely worth it. But yes, you can absolutely make and ship games completely in C++ that are exported for the web with Godot 4.