After defeat Boss level 1 the game doesn't load level 2, the screen stays simply black.
Thanks for the report! As serious as it may seem not loading a level, it's way more chill than what Pascal has reported. :)
Meanwhile, an idea for now is to ask for some WHDLoad trick that enables these buttons to be forced into the stable version of the game available on main download page. I mean, they can add a second button to an old game that had no second button to begin with, so, that would be smoother and safer if possible.
Perhaps this topic by jotd about CD32 pad could be helpful:
https://eab.abime.net/showthread.php?t=92160&highlight=CD32+Joypad+routine
Yeah, it's interesting! Btw, I just posted a new build (Nov8) on EAB.
Also, a last ditch effort if nothing else works, is to add the new intro to the July 23 release (Amiga40th) because the intro is basically what's new. IIRC Pascal told me that slightly older versions like that worked perfectly, controls and all. Earok surely would prefer that the game uses the most up to date version of engine (I would do to) but I work with modern apps with Unity and whatnot and there we roll back to older Unity versions routinely, it's part of the job.¯\_(ツ)_/¯