Great fangame! The puzzle quality is really good throughout the entire game and the environmental design is top notch. Revolution takes a lot of inspiration of Portal 2 and while it feels unoriginal in some regards (particularly in terms of story structure), the game still has its own charm. Voice acting was enjoyable too and Conly as a companion was a real highlight. The 'walking simulator' reviews on this game aren't too far-fetched either, considering a lot of time in Old Aperture is just walking a narrow path and shooting the occasional portal every now and then to continue. It really feels a little drawn out and there could have been a few more puzzles instead of 'exploration' parts. By the way, the final puzzle was pretty awesome! Ending was... alright.

If you're a fan of the Portal duology, Revolution is a strong recommendation on my end. Just don't go in expecting a mindblowing narrative and an exact replica of Portal humor though, all you need to remember is that it's free (and fun)!