A charming aesthetic reminiscent of 30/40/50s cartoon animation. Better said; a game "heavily inspired" by Cupheads general look. It's actually quite impressive, especially considering these aren't the devs from Cupheads, though you'd never know at a glance.
The gameplay takes a top down, arcade styled bullet-hell that works perfectly for the mobile platform. In fact, it's interesting that no "big" bullet hell game exist on mobile.