SteamWorld Tower Defense, Dig 1 and 2, Heist, and Quest are all part of the SteamWorld universe. It's been a hugely successful franchise for Image & Form, and you can bet they aren't ready to shelve the series yet. In an interview with Kotaku, CEO Brjann Sigurgeirsson had this to say.
“SteamWorld is indeed closely associated with Nintendo, and we certainly haven’t made our last SteamWorld game. Nintendo Switch (and future Nintendo consoles) are natural parts of those plans.”