As a kid, I played Keen 1-3 religiously. I had Keen Dreams and the shareware version of Keen 4 as well, but didn't like them as much, so I never had much interest in trying 5 or 6. While I maintain that The Earth Explodes and Keen Must Die have excellent aesthetics and levels, this one might be a better game?? This probably doesn't sound like a big revelation or anything to most people, but the Invasion of the Vorticons trilogy was arguably my most formative gaming experience. It turns out that I was simply ignoring an incredible sequel for all these years, and I'm very glad to have finally finished it! Definitely won't wait another 25 years to beat Aliens Ate My Babysitter!