There are two problems with the vase puzzle. First, Lily's dialogue just straight up tells the player how to solve it. The clue on the blackboard about buoyancy is enough for the player to figure it out, if the game just tells you what to do then it's not even a puzzle. Second, it makes no sense because Lily could just pick the vase up and turn it over to make the item fall out. Is it glued to the table? Even if it was, she could just smash the vase with any blunt object found in the room. It's really anno...

It would be nice if the characters would move faster, so a running would be a nice add on. So far I really enjoyed the demo and this is so far also the only thing that was bothering me a bit.

好像我就只玩到一个坏结局就没有遇到其他怪物了大部分时间都在走路有点麻烦

Here is the gameplay of the demo with some feedback for the devs. Add a tutorial to the game to explain the mechanics. https://www.youtube.com/watch?v=8g_zKCFz-aA