Tip: If you place a moon, midpoint, or dragon coin through Map16, it will always respawn whenever you reenter that sublevel. It will not respawn if you add it through the Add Objects/Extended Objects window.
Fun little level with quite a bit of challenge packed in at parts without being overwhelming. If there is an update, I recommend fixing up the overworld a little bit, though I figure the aesthetic is intentional. The 'event' after level completion at least might at least benefit from not being whichever vanilla overworld event it is.
Side note: there's no save prompt, so you won't see an exit counter on the title screen ever. That's not an issue, just a warning for those who play it. It's still an exit because it triggered an overworld event, etc.