That was really nicely done! You could really feel the weight of everything you moved. I liked how some puzzles could be solved in multiple ways, and it wasn't super punishing except for the last scripted event (which was very cool and unexpected). Crashing into blocks to make them fall was very fun. It kind of felt like an underwater '2048'. I wish there had been a checkpoint before that final room though, because I got caught under the rubble a few times and had to restart all the way from the beginning. Great work!