Well spotted! I've updated the build with a fix that now keeps Mario onscreen on game over when falling from the bottom girder :)
I'll do some more testing but I think it's ready for release later today. I'll let you when it's available officially on RetroLab. I'm really excited for people to play your game! Thanks for all the time you spent testing and for being such a tough client ;)
Thank you also for the offer to share programming credit, but it's not necessary. You've done an amazing job and you should get full credit. I'm just happy to be able to share it with others in the RetroFab format :)