I agree it's not too hard, but my reflexes ain't the same anymore. Anyway, I tried beating the first boss and nothing wrong happened, it just went on to the second stage.
I encountered a problem using sofarun 8 when launching sg1000 roms. The roms work perfectly and sound ok, but on some games, for example wonderboy, the fire button is also mapped to the pause button and cannot play the game without fire. On simpler games like galaga there is no problem because there is only 1 button used.