Neat puzzler! I was also a little confused at first, but not for long, and was generally able to progress. A few things were unclear to me, though, like every "2 actions" would result in the yellow stuff extending in the direction--which I thought depended only on the 2nd direction at first, but then I tried (just experimenting in level 2, having the first action be right, and then the second action be right again, and the yellow stuff didn't move at all. However, up, then right made it go right. So I was just confused there, like why the direction of the first action seemed to matter, but only in some cases. I might have missed something though.
That aside, definitely enjoyed playing as that bit I mentioned wasn't keeping me from going on. One thing that might be a good idea is if the restart level button is not next to the action button, someone might get to the end of a level and accidentally press restart... Not that I would do such a thing, but others might, you know...LOL :-P