The new version is still going to be plenty chill, though definitely less retro :)
I'm afraid there is no option of making the new version use pixel art graphics, even though I understand some might prefer it. It'd require making two versions of everything in the game, essentially - which probably wouldn't be a good investment of the development effort as opposed to actually finishing the game :)
Again, not to push you in any way, but what if it had a similar skinning system to osu! or Minecraft, where image assets can be changed or swapped out in the games files (they tend to be in their own separate selectable folders but thats basically it) ? Maybe this could cause interesting skins based on playstyle or color.