If you loved Der gestiefelte Kater im wilden Westen, try Mazinger Z vs. Devilman
Eine Brücke zwischen einem Film, den du schon gesehen hast, und einem, den kaum jemand kennt. Das teilen sie, und was der zweite macht, was der erste nicht macht.

Der gestiefelte Kater im wilden Westen

Mazinger Z vs. Devilman
Was sie teilen
Both films are directed by Tomoharu Katsumata, and they both carry the playful mood tag, and they sit in Adventure / Animation territory. If that's the register that drew you to Der gestiefelte Kater im wilden Westen, the second film will land in a comparable space — through a different lens.
What Mazinger Z vs. Devilman is
You pilot Mazinger Z when a routine battle accidentally ruptures a volcano. The blast liberates the Satan race from their millennia-old prison and Dr. Hell immediately recruits them. Phoenix Jenny rises with wings darker than your steel. Meanwhile Devilman flails against the same horde solo. Katsumata’s 1973 mashup leaves viewers dangling on the edge of a 43-minute face-off between two titans.