Interesting simulation, but tbh I don't see it as a "game" much. Even as a idle game concept it doesn't work as well since there's no goal to get to or some fail state to avoid. It's definitely an impressive technical showcase, but gamify it a bit more and I think it could be more engaging.
Not sure what the "error" represent though, do they just randomly appear instead of horses?
Overall funny concept, would love to see it be expanded with other ideas.