There are multiple translations and ports!
It's free!!
There's even entire new engines for it!!!
You can get it here: https://www.cavestory.org/download/cave-story.php
Play cave story! And if you like it enough to give the dev money buy Kero Blaster and Pink Heaven on steam!
Cave story plus isn’t real it’s a lie the evil ball man in the centre of the earthmade up to fleece you out of the beautiful (free) experience that is Cave Story!