Okay that was really cute x3
While exploring I was already paying attention to why there were so many cracks on the floor, tried to step on them to see if I'd fall. When I took the gem I did not expect the collapse it caught me by surprise even if I had been expecting something to happen, had to quickly focus real hard to get out, real fun little experience! Congrats!
(Even though it is quite short and simple it's genuinely one of the games that's got me the most surprised/tense; Also the MC looks like Sakamoto San, so that's also great.)