Nicely polished game! I think you should stick to either the boulder becoming unstable over time or with collisions and not both as it makes it very difficult. Fun level design and unique concept.
Thanks for the feedback! I agree, but I wanted to keep the precision aspect. If the player has too much time, though, there’s not much of a challenge since they can just take their time to position themselves. I might have given them a bit more time, though.