I can't remember which Commander Keen I played but I don't remember it looking like this. I also remember playing the first Duke Nukem which didn't look much different.
I love the Sports Center jingle when you reach the end of the level.
This game is so good. I wish my computer still had a floppy drive, because it's still on a disk not... 15 feet away from me or so. Shareware week makes me feel so old.