Sorry for the late reply! The second item should be a mask, and the third should be a knife. You need to explore more rooms or go back to already visited rooms in order to make progress. The "axis" in the second hidden room can also be interacted with, once the doll is placed on the altar.
Thank you for playing though! Please note that the game is but a demo for now, so regardless, it'll be very short, but these tips should help you finish it properly. We hope you found the atmosphere & overall vibe to be worth it though!