Thanks a lot for your comment. To hear that you've had fun with it when I've been trying to find fun in it myself, I really appreciate it :)
I agree with your thoughts on learning curve and balance, definitely needs working on. I did actually have a "grab" feature in mind but I'll need more time to implement it.
At last count there's 6 different methods of getting past the tutorial door, but I'm glad you went for pushing the boulder on the button as I went for making that more noticeable since my last playtester.