An impressive piece of work: although its core appeal is probably limited to nostalgia-addicted baseball nerds (a category which, as far as I can tell, makes up about 99.95% of baseball's fanbase) it succeeds in emotionally engaging people who don't know or care about baseball and are never going to.
The game recounts a famous 1908 screw-up that defined the career of Fred Merkle. From the outset, in no uncertain terms, you're informed that the disaster is coming and that it will scar your life. Yet you still keep working towards it, through a difficult commute and an indecipherable morass of baseball terminology. The game is broken up by flashbacks that imply the main story is just a flashback. There are obvious debts to Photopia and 1893: A World's Fair Mystery; one could choose worse models. It seems diligently researched.
Bonehead has a number of conflicting, emergent morals, some of which the author certainly didn't intend. The point could be that Merkle was a clueless blunderer, only barely holding on moment to moment, and some horrible mishap was inevitable; this comes out of gameplay, and contradicts statements that Merkle was actually pretty savvy. Another is that Merkle is a sort of sticktoitive hero, unable to give less than his all even when it leads to his destruction; this feeling hangs around the story even though it makes no chronological sense. Another, probably closer to the intent, is that even solidly competent people fuck up all the time; whether a fuck-up goes unremarked or haunts you your entire life is largely a matter of luck.
Bonehead's main flaw is a tendency to cheesiness that it can't quite sustain; there's that historical-fiction thing where you always meet significant historial figures who are just now thinking about something that will ring down the ages, and there's a Hollywoodish moment of Touching Redemption. Overall, though, a really strong debut.