It may be related to the theme story-wise, but certainly not on game design. Maybe you could've battled Nega Scott several times, and as you learnt moves, he would too (or choose advantageous moves, like Gary on Pokémon), making him an interesting villain. Kudos for trying something new for you under the pressure of a game jam.
Check our game! https://cerosware.itch.io/one-stick-shooter
Viewing post in Head Ache (GMTK 2019) jam comments
We wanted to have that end battle much more complex but ran out of time for it in the end. Our initial idea was to have a three stage fight with Nega Scott which would get progressively harder and involve much more dialogue between his negativity and himself, trying to get through it and the mechanics of the fight would differ based on what options you pick during the dialogue.
BUT its a 48 hour game jam XD
Also we wanted to create a game specifically using narrative rather than gameplay because it seems like everyone here has done the latter, and we wanted to be different.
I'll add your game to my list, trying to get through as many as possible using my forum post and comments here, so there is a good chance I'll get to it tonight.