I really should have asked this before writing my song. but do you consider the GSC versions of the Kanto songs remixes? I had considered some to be sufficiently transformed. Hence why I chose that idea as a core theme...   

Hey Nick,
Im not sure if you've run into this or not. but a great reference for the GB era games is a YouTube channel call "Full VGM Deconstructions"
as the names implies they have full channel deconstructions for many tracks.

thought id share that incase you haven't seen it.

Pokémon does have songs that I think fit that darker ambient vibe. Here is quick list that might help you get on track/inspo
Hall of Origin: Pokemon Pearl,Diamond
Deep within Team Galactic HQ: Pokemon Pearl,Diamond
Drought: Pokemon Alpha saphire,Omea Ruby
Deoxys Appears: Pokemon Fire Red, Leaf Green

and I'm sure there are more in any of the later generation games.

Is gathering feedback allowed prior to submission? or is it limited to just to jam participants?