This was well executed for being a fairly bare-bones implementation. There probably needed to be some sort of disincentive to just mashing the space bar, whether that be a cooldown or something like an energy mechanic, to avoid trivializing the mechanic too much. I also think it would have been nice if the player had a health system so that the enemies weren't one-hit kills. I feel like, based on their design and behavior, it was fairly clear that they needed to be avoided, but because of how they moved, it was a little too easy to hit them accidentally, and adding a little forgiveness to that would have been nice. It would have been cool if the echolocation revealed objects radiating outwards, and not even necessarily showing the entirety of the visible block (perhaps using something like a shader script), but I understand that's probably too much for a single person in a 48 hour jam. This was a very cool game as it is, though.