I like what you're going for with this game, I think at its core this is a solid demo that shows off what you're going for. I especially like the fact that you've built the tutorial into the natural progression of playing the game, which not a lot of games in game jams tend to do. However - I think the experience of actually playing the game is held back by a couple of things that can be, and should be easily improved on first:
The bird calling mechanics
To use the bird call, you have to hold down a key for what feels like forever. At first it may not seem like a big deal, but when you have to repeat this mechanic hundreds of times, it starts to begin to feel like a chore. I imagine later on you may want to do the short call, but in the parts of the game that I played, I only ever needed to do the long calls. Swap these around. Make the long calls just a tap of the button, and the short calls the long-hold tap. This is the core mechanic of your game, and it must feel really good to use.
Bad Pathfinding
Haze seems to want to move in a straight line between his current position to the bird's position, and he can get stuck on a wall very easily. Similar to the bird calling - this is a major core mechanic of your game, and not having it work the way you expect it to is a huge issue. Haze needs to be able to at the very least maneuver himself around corners.
Other than that, I've gone through around 10 games in the gmtk submissions and this was by far the best one so far (though it may not last long!). Also have to compliment you on the art style and quality of the presentation was mostly quite good, unfortunately it just isn't 'fun to play' in its current state because of those 2 things making the game feel frustrating to control.