The climbing system is really good. It felt very easy to use while still requiring focus to not accidentally mess up. The mushroom sort of blended into the background a bit -- perhaps giving it some more contrast would have been helpful to make it more obvious?
The first mushroom I found was worth 11 points, which I'm guessing is pretty low on the value scale, and that felt like it took quite a bit to get to. I wasn't able to get super far in, so maybe these came later, but it feels like there would perhaps need to be a bit more mechanics over time to keep things interesting in a longer version of this game.
But overall, this feels really nice to play, and has a bit of the "holding" simulation that reminds me of GIRPS, which was really nice to see.