I think this is a really sucessful approach for this prompt! I love your choose of sound effects when the smaller triangle hits the larger one. One thing that bothers me a lot is the speed of the background's rotation. Some times I feel like it is rotating too fast that I start to feel a little bit dizzy ( but maybe it's just me). I think instead of increasing the speed maybe you can add something else to the level to increase the difficulty, like other obstacles. But overall, really good game!