It felt too easy i guess, you really didnt give yourself room to have good level design as there were only like 3 layers of triangles. The art was lacking, and I think it could have done for a bit more thought. For example, since it is a simplistic game, the triangles in square spaces felt awkward. At that point, they might as well be black squares that indicate a hole.
It is a functioning game that feels completed for what you were going for, so for that, great job :D