It was refreshing to play a game about exploration, there was very few games I have seen in the jam focused on that. While you had exploration, it wasn't mindless exploration either, you had an objective and a companion to guide you, and that helped a lot.
I think having things like the jump button and being able to stay on sides of mountains was super helpful, because it made traversal a lot easier and less punishing that it could have been. It sacrifices some realism, but I think the tradeoff for gameplay vs realism is worth it.
I would have liked there to be some more visible tangible projectiles coming out of your gun whenever you shot it.
I ran into a bug whilst climbing the fourth mountain / tower where the action music started playing, so I expected to see enemies, but didn't see any, then the game said connection lost and started me over. Other than this, I didn't have any bugs. I enjoyed my time with the game.
I think you could also benefit from some screen shake when enemies explode, to go along with the kaboom particle effect and sound effect. This is how I do screenshake in Unity: https://imgur.com/a/rWEMD0U