Super Triangle has a super game feel. The stretching animation of the small triangle and the rotation of the triangles are very satisfying. Since this is an endless game, I am tempted to keep playing it as a passtime.
My suggestion would be to add background music to the game, which can compliment the game's fast yet endless pacing. Also, I hope there is a way to keep track of my scores, such as how long I survived or how many jumps I made.