Thanks! I was worried about the difficulty because I had my friends try it and they couldn't beat it, and I didn't know if it was because they don't play games or because it's actually hard.
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Yes this is very tricky to deal with during development. I'd say, get a lot of people to playtest it (which you probably have), so you have a good range of people to adjust the difficulty accordingly. Also, I realised that in a lot of situations, I did not mind the difficulty if there is something that shows me I am close to reaching the goal and the game gives me feedback. In your case, you can see cracks forming in the rock, which shows me how damaged it gets. If I did not have that, or if the visuals and audio were not here to keep me engaged, I may not have been so patient. So again, well done!