Thanks for the feedback. I have funny feeling I know where you got stuck, I think it might catch a few people (if not all).
I might look at little tweaks after the jam just for completeness sake. With the reset, I didn't know whether to allow resets, or try to use the Itch page itself as a restart button. I did put some thought into letting the player wipe the screen of bricks, but then I thought that it would make some it a bit trivial. I might make a small change after the jam to give some relief though.
Side note: The character controller is an inbuilt feature of Gdevelop. It works pretty well and you make some changes to get it working to your needs.