Thank you for playing!
It's based on velocity. Abi gives you a jump that is based on the current velocity, so if you are falling down and you use Abi to glide you will get an enormous height boost. This was one aspect of the mechanics that was intentional. It does make for a varied jump and adds to the challenge by having you as a player need to time your jumps and plan your motions. We knew that there would be people who may see it as an inconsistency or a bug, and decided to run with it anyway because it did add to the experience. When it was a set static distance, it didn't feel as "fun" to play when testing the mechanics. :)
Viewing post in Gelda (TVGameJam Edition) jam comments
The aspect itself is cool. But you should've explained it (that I need call Abi while falling to get me high up) somewhere in the game.
P.S. Also, you have a bug on the second level - if I take lower path and call Abi to lift me while falling, it takes me up and I drown in the river that is on the upper path.