Super fun! I enjoyed the sound effects and thought they worked really well. For me the lack of music helped build tension, especially during those risky wager intervals. On the visual side, I also appreciated the subtle things like how the player changes shape as they bounce to create a sense of movement.
I found myself with a ton of gems by the time I reached the end, but I assume that's intentional to avoid making things become too easy, and instead make reaching the top all the more satisfying?
Overall, great job!