Rocketron

"ROCKETRON is a single-player Anime Platformer game with a strong emphasis on grinding. As the cybernetic warrior B.L.A.M from the Argo Express peacekeeping group, you'll use a rocket musket and 8 different weapons to combat "The Congregation of Gogoh," a mysterious group inciting global insurrection in 2049 on the cyberhuman planet of Metnal 28. Experience solid combat and non-linear exploration in this high-flying side-scrolling action shooter."