I think that is what's called a rage game, it feels intentionally hard to control, I had a lot of trouble to get past even the first obstacle ! It is pretty well made, but I think making the spring a little less stiff could make it a bit more enjoyable, and allow more things in terms of level design. And maybe a little bit of feedback on the spring itself would make it more understandable, sometimes you don't know if it is pushing or pulling.