I'm not trying to sling guilt, but I honestly have to wonder what titles we don't know of that were "ghostcoded". Squaresoft and Capcom once had some CRAZY output especially for SNES/PSX/GBA
Lots of them. There are entirely dedicated shadow companies for this.
Along the same lines as Donkey Kong/Congo Bongo, Nintendo's first arcade game, Radar Scope, was also made by Ikegami:
Who, in the same style, went to Sega and made an isometric spiritual successor in Zaxxon: