I finished the first world completely in 10 hours and played an hour on the second map. Before I begin, I must say that I am a huge simp of mining games, especially ones like SteamWorld.
It was nice to play the story, but it has mid-tier gameplay, so I did not play every level. It will get you hooked on itself in the first world and you will see to its ending.
It's likely that we'll get a sequel to this game based on its ending.