Very cool game!
If feels really polished and complete for a Jam game, I actually feel like it could already be a full fledged game buyable on Steam or on mobile.
But even though it is a very high quality game, I just can't have fun with the jump mechanic. Rage games are clearly not my forte, but I feel like other rage games didn't frustrate me nearly as much as this one.
At first it was because I couldn't undertand the correlation between the angle and length of my line and the direction and speed the character got propelled at. At times it really felt like a shorter line actually gave more strength which confused me even more, but I think that was because of the angle.
After I understood that the direction was perpendicular to the line drawn I could actually start playing, but even then the game being really hard made me quit pretty fast after reaching The Cranes.
Anyway, excellent work! Since it's clearly a me issue I didn't apply my negative feelings to the rating because I don't want the game to have a lower rank than it deserves.