Ooh, I remember this! I heard the WIP on soundcloud more than one and a half years ago xD
And I still instantly recognized the sound within the first seconds! That must mean you're doing something right when it comes to sound design recognizability.
The WIP was good, but I like this finished version better. I actually prefer the later half of the song. The rhythm is nice and solid. I guess the percussion at some points could be a bit louder, imo. A lot of interesting sounds and effects are used, which I love (always so much going on). This actually reminds me of some retro video game music (more american games, I think). The mix sounds pretty good in general. Good dynamic balance.
The melodies are okay, though I don't find any of them to be incredinly catchy (those sub-melodies are really nice at times though, like the bass-synth-ish stuff). That said, I liked what was going on at 2:38. I think that at 1:41, 1:48, 2:54 and 3:01 I would've preferred if the highest note was actually held for a while instead of immediately gliding back down, as it now only hints at what could've been the sweetest spots (or the peaks) of the melody, which kinda left me haning a bit.
In general, I really enjoyed the piece, and I'm glad that you finished it. This has that distinct "TheDoor6" quality to it for sure, and I've missed it :)
Good job, and keep it up!