Very nice! I enjoyed the gameplay overall. One minor adjustment I would have liked is having the display count of the ritual show as soon as one stone is placed. Having to place all of the stones to figure out the values of everything felt a bit tedious (to me at least), but I understand it's a jam.
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Thanks for your comment! My idea was actually to put players in a situation where they have to deduce the effect of each gem by combining them with others. However, I completely understand that the way I implemented it could be a little tedious. I think that to remedy this, a kind of notebook that would be updated with the values of the gems already deduced could have helped. Maybe I'll add that one day!