Even if the controls felt a little slippery, I think that actually did a really nice job of conveying the feeling of being a person navigating a cave they've never seen before, and having to think carefully before each jump. I also love the little sizzle sound effect of landing on the red blocks- it's a nice little touch that elegantly conveys to the player that these aren't just generic instant-death blocks, they're specifically red-hot. Nice work!