Routine instead of eventu (read the warning) (replace eventu.run with Routine.run etc.... it should be a 1:1 conversion in most cases)
Textplus instead of textblox (+ graphx, mathematx, etc) (this one's a bit more involved... we're working on a proper wordbubble script)
Paralx2 instead of Paralx (check the
handbook)
NPC.config instead of NPCConfig. (for example, NPC.config[1].nogravity = true makes goombas have nogravity)
Play levels in the version they're made for to avoid issues. Betas don't have guaranteed compatibility between each other.