"I began prototyping Graceful Explosion Machine in mid-2015. The initial spark was creating a shoot-em-up with multiple weapons that the player could switch between effortlessly. It started with two weapons, but pretty soon I thought “Wait, why stop at two?!” With four face buttons on a controller, wouldn’t four weapons work? It did, and everything else grew from there."
The game is currently on a 50% sale on the eshop, but if you're Switch-less the game is out on PC, PS4. In the same post, Mobeen Firkee mentioned the game sold just under 50000 copies on the Switch. We also know what's next up from the developer:
"Speaking of which! We are definitely working on a new game, and we’re excited to share it with you… but not just yet. For now, let’s state the obvious: it’s an action game, it’s colourful, and it’s coming to Nintendo Switch in 2019"