I made this for myself, so I could train my skills in Cave Story.
Download
Choose "Load" so you can start directly from Sacred Grounds.
If you choose "New" you can see, that I've edited the first maps too.
It's in .rar file, if you can't open it, tell me, I'll upload it again then.
As I said, I made this for myself, but when I saw this post I started to edit Sacred Grounds. It's not ready yet. I think I'll make 5-8 levels for it.
There are few save points in there, so it'll be little easier.
Once again, choose "Load", so it starts from Prefab Building.
Tell me if it's too easy or too hard, I'll edit it then.
I just picked some filesharing website from Google, so hope that works.
By the way, it's meant for flying with Booster, but I'll add there some enemies too, and hidden health. See if you can find all health from first room, there's 17 of them total. Remember they are hidden, so you must shoot them, to reveal health.
Updated the link.