Thanks for playing! Really appreciate you took the time to play through all 3 Zones and get to Act 2.
On the note of the Act 2 Zone 4 boss, there is definitely some synergies you need to be on the lookout for to get a strong party for the attempt. Anything you don't get via the skill level ups can be covered with item pickups. Study the boss phases and see what you need to do for each to shut down each of its moves (e.g. Healing can be prevented with the Jammed status effect). Internally, we were able to get a ~70% clear rate on it over a 100+ playthroughs with fully randomized skill selections. So it is definitely possible but a bit of a challenge which the Final Boss should probably be (SoC isn't a full RPG so we can't quite split the Plot Final Boss from the Super Boss).
We'll incorporate your feedback into the next iteration of the game whenever that happens.