Hey! I am a YouTuber that has a channel that specializes in SMBX Gameplay, it used to belong to an Internet mate of mine.
If you got any episodes or levels* made with SMBX 2 bMAGLX3 or SMBX 38-A, send them to me via private message and I'll happily do a playthrough of your level. If you send me an episode I'll do a whole let's play series of it from start to finish.
*Playthroughs of single levels don't have commentary.