Update, and a change of plan: the itch build now stops at the end of chapter one, Korea (1.0.54 is live). Korea is complete as it was — 57 species, the zoo, the shelter, Grandfather's island. Buy the ferry ticket and board at the pier and chapter one ends there. I'm working toward a Steam release (early access, aiming for next spring), and Asia and the rest are planned for that version. If your save was in Asia, the boat brings you back to Korea and nothing is deleted. Full write-up in the devlog.
Also in since 1.0.50: the field and the zoo run about three times lighter, the dog no longer barks (it was reading as animals charging you), the range circle is a single tick on the aim line, the zoo uses the whole screen, and there's a "Title" button in the help window.
The reason is the one you'd guess: two months left before exams, and I'd rather have one chapter that holds up than two that half do. If you take a pass at the Korea build, the question is still the same — where does it get boring?