Oh my gosh, this is such a coincidence! I'm currently making a Super Mario Bros. fangame in Godot 4 as well! Do you think you could maybe help me with some coding things? Even in this beta state, you've gotten so much further than I have and I would really appreciate it if you'd let me pick your brain on how you made things such as the different blocks and Goombas, and especially the flagpole functionality. If you have a Twitter or email or anything, please let me know!