Definitely had some issues figuring out what to do on both levels. On the first level, it took me a while to realize that the arrow sped you up. On the second, it took a bit to realize that the circle was a bounce pad, and when I got to the next platform I ran straight into that wall not realizing that it was physics enabled, and knocked it straight into the pit.
Platforming felt pretty floaty, this is a tutorial that I used in the past to get my jumping feel a lot more controllable. You can also jump when you're colliding with the walls (I had some fun with that by knocking into that physics enabled wall and jumping constantly to stay attached to it).