Really fun concept. Iiked it a lot. Had a few bugs trying to placed the obstacles, sometimes it just wouldn't let me select anything and I had to refresh the page to get it to work. Sorry I couldn't find out exactly what was causing it. But it didn't ruin my fun and I really enjoyed it. As others have said I think it would benefit from some easy tutorial levels easing the player in to the different choices. For instance I don't understand why you would ever use a carot rather than a spike, they seem the same to me but higher reward for the spike.