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(+2)

A maze game without sight, I dig it! Constraints of a 48h game jam aside, this is a neat concept and definitely has potential to roll into a game once there are some other mechanics at play. Maybe add a time limit, game over on wall hits and sonar as an expendable (rechargeable?) resource. That way there is incentive to try and go without sonar to beat the time but a repercussion for not using it.  Cool cool cool. 

(+1)

Yes, thanks, those are definitely thoughts similar to my own. I also noticed it might be good to actually know the bat is moving, even if it's completely dark. Hitting walls sounds a bit too harsh though, getting stuck is punishment alone I guess.