Congrats on this IC and GB announcement.
For a set themed after a celestial phenomenon, I would have expected celestial-themed Enter novelties. I think of Enter novelties as thematic centerpieces, but your use of mountains and trees feels more appropriate for sets like Alpine, Ursa, Coniferous or Botanical.
If you're open to a bold suggestion, I'd also consider running the mods with gradient legends
as your base kit mods. It would further emphasize the theme and offer something truly unique, since there are lots of neon-on-dark sets floating around (Metro, Pulse, Phosphorous, Miami/Vice Nights, etc). Also, it's arguably
more on-theme than the current color scheme, since aurora borealis seems to be predominantly green with fluorescent highlights.
Then again I know it can be challenging to make radical changes to a keyset at this point. Just a thought, though!