Platforming shooter reminiscent of some Treasure co.ltd. games (Bangai-O, Silhouette Mirage, Gunstar Heroes etc.). Has tons of small varied levels similar to Bangai-O, many with puzzle-like structures encouraging clever weapon use. There are plenty of boss fights which are engaging enough to be a highlight of the game.

A main feature is the player character picking up various weapon archetypes which can be combined into unique combination weapons, adding up to a ton of available weapons. Throughout the game you end up mastering a lot of attack types to get the upper hand, from basic straight shots to manual detonation mines, melee attacks, slow wall piercing explosion shots, etc.

Hard mode & each character has unique content like new boss fights so there's a lot of content if you enjoy the core gameplay.

By default you have to open menus to switch weapons. There are options for both characters to swap all weapons on the fly without pauses. I highly recommend those settings if you're familiar with weapon/style swapping in games and don't want to get put out of the action.

There are so many weapon combinations that it's likely you won't see some weapons in a single playthrough. This might sound random but the weapons are balanced well and once you get some favorites you will intentionally aim for them. It never feels like you're forced to use bad weapons. Available tools are designed to work in each stage and often a stage teaches you to use them in a new way.

Copy Kitty has two playable characters that work very differently from eachother. The default is easy to pick up and has solid platforming control while the other has technical weapon use and shmup-like movement. I'd say some of the levels feel better with the first character since platforming stays relevant. On the second characters controlling the weapons can be satisfying and very unique to this game, but I recommend playing through with the default first.