The controls are easy to understand in theory, but hard to work with in practice. One of the main issues is with letting it stretch beyond the maximum you allow, which means it is unclear what the maximum is, and makes it hard to figure out how much exactly you're pulling. Another of the issues is that parabolic trajectories aren't always super intuitive, which is why many games that use them have (partial) predicted trajectories. A way to quickly restart a level would've been a nice addition, since screwing up one arc means it might be best to restart the level.
That being said, the feeling of the jumps is great and the graphics are nice. There's some nice polish and the levels are interesting, it's really good for something done in 48 hours!