Congrats to them! it's good to see the indie devs succeeding.
According to Vertex Pop, Graceful Explosion Machine has sold just under 50,000 copies on Switch. This is such a remarkable achievement for then and they will continue to support the game (with features like the new score screen, highlight screenshots, and video capture). The studio has confirmed that a new game is coming to Nintendo Switch in 2019.
(=^・ω・^=) Kuroneko S2 - Ore no Imouto - Steam, MyAnimeList and Twitter - PSN: Gustavo_Valim - Switch FC: 6390-8693-0129 (=^・ω・^=)