Oh that's a shame. Yeah we can expect these things to happen when we try new stuff. Honestly the new art style is great so i don't think you should let it down forever as it may still work. About stuning the enemy i think it is more about the design of the attacks, for coding that some developers decides to make the attack itself as an status triggerer attack but it oftenly causes bugs. Renpy is a tough option for RPG like games so i acknowledge you may have been struggling for building that roam, and not gonna lie, it is well done.
For what Cursed Overlord game was, it is so far one of your best games. People likes these kind of games where there is way more gameplay than just depending on the H from that game. RPG games are already hard to make and you do a great job into popping those dopamine shots at the right moment before the game becomes boring from a grind. It is one of those games that i would say "damn, i'm gonna kill some time completing this game again" and that makes a game worth buying.
All the changes respective of this game as a sequel are not just mistakes in the process. Experimenting with a sequel instead of another game or spinoff is already too risky. Making sequels is already problematic because it is doomed to be a failure if you don't make it same as good or better. That's why many creators prefers not making sequels of their game, even in the cinema world Jim Carrey oftenly refuses to make sequels of his movies due the same reason. Yet in this case the free roam was an ambitious and good choice for a sequel, despite everything else.
Keep the good work!