Oh wow, you're the first person I've heard say they got up to those last points in the game, well done!
The rocks forming a shield was definitely something I was considering - as well as them being able to intercept bullets after you throw them. In the end I wasn't able to get it implemented in time, mainly because I hadn't planned it from the beginning & getting it to work would mean changing a lot of other parts of the code. Just goes to show how useful it is to plan these things out ahead of time!
Thanks for playing & giving feedback!