Thank you for trying it! To the climbing question: yes, at base camp there are only a few rocks that you can climb on but once you enter the cave every surface that you see can be climbed, including the crystals! :)
Yes, the lack of music is intentional. Real caves are very quiet and the lack of sound can make them very erie to explore lol. I wanted to add some footsteps that echoed but I couldn't get them to sound right in time for the jam so I removed it. Definitely something that I would like to add though!