Thanks to Ray1map having level maps for Klonoa Heroes, I've started work on a tileset, but I've only barely started it.
The tiles for Heroes are a bit small for RPG Maker MV, they'd probably work better with RPG Maker VX or VX Ace, but RPG Maker MV is the version I own, and I got it on sale for $8, because I know I'm not going to finish any projects I start with it curse you, executive dysfunction!