Commander Keen in Goodbye, Galaxy is part of the Commander Keen series, a good topic. This is identified as among the best series of articles produced by the Wikipedia community. If you can update or improve it, please do so.
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There's a couple of duplicate images. Keen Dreams in the first paragraph of Development; the Commander Keen series in the second paragraph of reception, and Wolfenstein 3D in the first paragraph of Legacy
Lead: Could do with a brief mention of the reception.
Development: "which was missing in prior Keen games" - best to change this to something like "which was not included in prior Keen games" as otherwise it reads as if music was accidently left out of previous games and then that music was added this time one. I presume that isn't what happened.
"and schedule Aliens Ate My Babysitter" - comma after schedule
"the fifth episode, however, was created within one month" - perhaps better as "the fifth episode, which was created within a month of it"