Running it on Sameboy, and tried all the buttons and no luck.
So, you can confirm it's the latest Sameboy release and that you have all the buttons configured properly?
I have also tried the exact ROM file on Itch.io in both Sameboy 0.15.8 and BGB 1.5.10 and pressing Start did get past the title screen.
I have even compiled the game from the master source code in GitHub and pressing Start there worked too.