First of all, welcome back, KeenRush!
Now, here's what I'd like to say about this mod; it's a lot!
When I downloaded this mod, I expected Keen 1 with just a new central gimmick and enemy behaviors patched in, like in KeenRush's previous mods (e.g. Fall Up has the gravity-changing plates). I got not only that but also a whole series of impressive patches! Seriously, it's like every level has something you've never seen before, not even in another mod! The cast is astonishingly huge! I think there was like over 10 enemies, maybe 15! The green fish with really long teeth sure looks a Dopefish; was that intended?

I totally didn't expect different gameplay styles! I'm utterly amazed on how much KeenRush was able to pack in within such a little 30-year old game!
I'm really enjoying this mod! I think I only got a few more levels to go. I like how the levels generally focus on exploration and collecting, with a few fun Mario-like levels mixed in. So far it isn't too difficult, although a few of the later levels gave me a good challenge. I have played all of KeenRush's previous mods (Xky1tuned excluded) and beaten them all (except Fall Up), and this feels like one of the easier KeenRush mods. I'd say it's still harder than Yorphius II, however, but it's certainly close. An easy mod isn't necessarily bad; while I do enjoy a good, hard mod, it's nice to relax in an easier one!
The story made me laugh!

The palette is so good (it really has a sunset feel) and the graphics are really nice; proYorp and KeenRush did an amazing job! Even the cruder drawings look good! The new sound effects go really well with the originals!
This mod totally deserves more attention! KeenRush and proYorp made quite a fine work of art! No other Keen 1 mod (any Keen mod actually) impressed me as much as this one!
With so many features packed in, I actually think this mod would be great for levelpacks, a community levelpack perhaps! The only problem is that some of the patches seem to be hard to work around. Like, is each level encoded a specific gameplay stlye? Can it be easily changed in the patchfile? I don't know the answer to either question, but I have a feeling my assumption in the former might be true. The enemies are a concern. I applied all the patches to an otherwise unmodified copy of Keen 1, minus the tile properties and level names (DosBox said one of the latter was too long), and it seems that enemies will act based on their starting location. I had this level with a lot of Vorticons grouped together and some acted like the beetles while others acted like the walrus Dopefish.

The Luma Lightbug levels look like they would be a pain to make, since they have to be all dark! Grandy02 sure did a good job with the Luma Lightbug levelmap in KeenWiki, it definitely didn't look like a quick task! I guess the level designer(s) would have to get really creative!
By the way, playing plain old Keen 1 with the Sunset patches was actually kind of creepy, thanks to the Butler Robots (Luma Lightbugs).

It's like the game got corrupted! It actually froze on me a few times!