One of my favorite games in the jam so far. Love the look and sound of Pico games in general, no exception here. The character movement also feels great, it feels very Meat Boyish. I will say the room with the water after you first obtain walljump is a tad difficult -- especially since you're a little confused on how the die mechanic works -- it takes some time to realize that you can jump pretty much any time in mid-air again, but only after you touch a wall first, and that's what the extra die sides are for.
But I think when my biggest criticism is that I wish there was more of it, I think then you've done a pretty good job!