This place have a stone with dialog box ＜(，，)logo and a purple ball in sky，i cannot solove the riddle (*꒦ິ⌓꒦ີ) please help me

Greeting, devs. Before the last dungeon (and visiting all the areas except that dungeon), I had 33 coins and one less life shards. My save file is from the demo version of this game. Would you like to check whether this situation is the result of bug between demo and released versions? Thank you very much....

For whatever reason, the only boss that is challenging in one hit difficulty is not in boss rush mode. I would like to practice this fight before another futile waste of 20 minutes getting to this fight only to die for the 6th time in a row.

I've tried to play the demo. Started it twice. Both times the game loads at a black screen with music playing and completely locks up my computer, can't force quit or bring up the task manager or anything. The game looks neat and I'd love to try it but this is giving me no confidence that the game would actually, like, work....

I can't find info online, anyone know? I could go try out and speculate but I'd like to know specifically what changes :)