The art in this game is second to none. I don't recall exactly what methods they used but it worked phenomenally. I absolutely adore some of the character designs in this game.
The boss fights are a tad difficult, yet still fun even through that! The story is also a bit charming, the inkwell style era makes things a lot more fun and there is a bunch of great music that comes from this game

However I have a hard time going back to it after completion as I cannot find any reason to ever really go back, once I've beaten a boss it feels like I have little reason to ever fight it again, I already know what to do and I can usually just do the same thing, nothing new or unique tends to happen as most of the fights are extremely predictable due to it being a bullet hell style game. Even by switching ammo types rather than having a unique experience it just feels like i'm making the game harder on myself for no reason. The actual levels felt a bit shallow compared to the grandiose bosses you would end up fighting either directly before or after, it's strange going from traditional side scroller levels into those.