I enjoyed it! :D
The art stlye is pretty and the intro cutscene is a very nice touch. ^^ The characters and environment are very well drawn too. :> The vibe of the game is pretty fitting.
The game is pretty short but that is alright. The sonar is a cool idea but ultimately it felt a bit like a chore to use. Perhaps the screen could stay visible for a bit longer or there could be more gimmicks to it.
Either way, it was still a good experience. :>