Wow, spectacular! Very well done! Every time I think, "I've played enough jam games, but let's do one more," I find a gem like this. The controls were quick and snappy, making me feel agile and skilled for avoiding falling rocks. There was a decent escalation in falling rocks without being overwhelming. Overall, solid package and well executed!
I could see this being fleshed out a little more and published on mobile. Maybe a few safe zones, like in tunnels between rooms? I was going to suggest falling indicators beneath boulders, but deciding when to look up and when to move is a clever part of the design.