Yes, it's awful unfortunately. I don't even use 3.0. I will reinstall 2.0 b5 and make any fixes on it if needed. It was a really good experience to play with your game.
Thank you for your positive feedback, I'm glad that you enjoyed playing my game. In fact that has inspired me to have a go at fixing the issues with the migration to GBstudio 3 and I have started work on it. I might make some minor changes as well and then hopefully if I can get it all to work I will publish the update as .gb, . pocket and html as well.