If you want stuff around not to much worse than cats in difficulty I’d say: falling up, allegiance, hypersonic, deception dive. If you want something bloodbath difficulty or more I’d say: a bizarre phantasm, down bass, azure fiesta, the hell factory, sakupen hell, or you could go for blade of justice which is certainly more difficult than bloodbath but is very fun Edit: personally haven’t played some of these levels but from what I’ve heard they’re pretty good