Is it still Pixel Art if ...? 

personally, i like the one just before the fog most

I enjoy both ends of the spectrum when it comes to pixel art. To me both sides offer interesting challenges that require the artist to flex their creativity in finding solutions. I personally really enjoy this style and do consider it to be pixel art, as it still captures a pixel art aesthetic, but with more detail. On the other hand, I also like the classic pixel art style and the use of imposed limitations. I find it fascinating to see how other artists find creative solutions to those limitations when creating their peices. Either way, both are great in their own respective rights. :)

It looks awesome but the fog can be too much, feels like half of the things u added got erased at the end, maybe if u tone it down a little bit u can find a nice balance(?

I can agree with limitations, especially time, ...so some non-pixel added effects can improve the average look of a game. But also think less is more. Trying to "hide" this effects sometimes can be a good way.

Something interesting to keep in mind the snes resolution was actually usually only as high as the nes yet it looks like it has a higher res because the extra colours.

Feels a bit like modern chiptune music created in Ableton/FLStudio -- It's something else than "classic" chiptune, but that's not necessarily a bad thing. Constructing music from just simple saw/sine waves can be fun, but also a bit harsh on the ears, adding subtle reverb/stereo effects, a more balanced bassline and some automation just makes it a lot more enjoyable to listen to. Similarly, as long as the spirit of the pixel art is preserved, I wouldn't view a vignette/gradient/shimmers as sacrilege to the artform, it just makes it more enjoyable to the eyes. The fog took it a bit too far though I think.

In my head I refer to this style as "Pixelated Art" and view it as modernized extension to "Pixel art"

The final product doesn't seem too far away from what you could achieve with 256-colour VGA. Posterise to 64 levels (because VGA only has an 18-bit RGB colour space), then reduce the colour-depth to 256 colours with an optimised palette and you'd have a version that could be displayed on a VGA display. Actually, working within the limitations of VGA could be a worthwhile exercise. Actual games made for it did include things like fog and translucency. Layers are straightforward. Fog and transparency is a bit harder. Given how slow hardware was back in the early 1990s, games used pre-calculated lookup tables for the job. Fog can be done with a 256-entry lookup table generated by finding which colour in the palette is the closest match to the desired colour given the fog colour. Translucency needs a 256*256 table for all possible pairings of colours with a given transparency value. BUILD engine games have a table of 2:1 mixes, which allows for two levels of translucency between opaque and invisible (look it up one way and get the more-opaque results, swap the colours for the less-opaque one).

Im curious to see what it would look like if you posterized the end product back to the limited palette to get the pixel feel back or if it would just turn to low-res mush

reminds me of Zetterstrand's paintings.

Im curious how to do the fog effect in such a pixelated manner, would be pretty cool for a video game

Definitely wouldn't call it pixel art at this point, but I don't think the label really matters, because the only ones who will really care are us pixel-heads lol. It reminds me of the style of art they're using with the Octopath Traveler games. It's very cool and an aesthetic that's worth pursuing if you enjoy it.

not first