Interesting concept. But the execution could do with some tweaking. It is pretty much luck if you get a level you can do, but if you do so, it is rather trivial to pass. It is pretty much impossible to judge whether a level will be impossible in so short a time, so maybe all levels should be made possible. As to the difficulty: maybe you could change the step lengths from 1,2,3 to 1,3,5. That way you actually need to think about lining yourself up with your chosen path. Also the theme of only one is a bit iffy. But the idea shows promise, and with a bit of improvement I'm sure you will be able to make a really nice puzzle game. Also maybe consider going 2D.