Thank you! Yeah, unfortunately there is a small bug in the level complete check at times, probably because I forgot to clear old player instances. You can press [Q] to skip levels for now.
Thanks for the advice! Gave it another try now. I also noticed I don’t have to open all treasures to complete a level, is that on purpose? Maybe there’s a “star”-rating depending on how many chests we open? Anyway, happy to know I can play more levels.