I have more experience in the board game space, but I completely understand having great ideas that very quickly prove to be impractical when you get to play the first prototype :P My very first one in fact was all about character synergies and boy was it broken! But it had a certain charm that I was never able to capture in my subsequent iterations on the concept. There’s a beauty in smaller prototypes like these where we can explore fun ideas without sweating about everything being super tight :)
There are definitely upgrades that create synergy between some of the characters, like having one that burns and another that adds poison to burning enemies, or one that stuns and another that deals extra damage to stunned enemies, but getting them isn’t a guarantee and the fact that some of them compete for the same color makes it difficult for the player to fully utilize them.
I could go on for hours about potential changes and additions, but I better stop before the game designer in me fully awakens :D Anyway, it’s impressive that there’s already so many party configurations to explore and the balance isn’t totally bonkers with so little time to playtest it. Kudos!