Stepcharts with BPM gimmicks like Heart On have notes that are extremely hard to hit because they are in an area with extremely high BPM, and PadManiaX seems to have scroll-based timing windows, not time-based ones.
nope, gimmicks and time signatures are ignored. i don’t know how to code that yet. for now the game is meant to be used with StepMania 3.X charts only