Adventurer Trainer runs on my own custom fork of Ren'Py (version 8.1.2 with lots of changes), and it seems that Spark uses its own distribution (8.2.3), which is incompatible.
thank you for the quick response pastry. Any ideas on playing on IOS or just PC atm?
I'm likely going to explore iOS ports in the future, maybe closer to the end of Episode 1.