This was a pretty interesting experience! I liked the underwater city, and the idea of swimming through the ruins of the city. I do kind of wish there were more objectives that required me to swim underwater though, as I only made it to the church. I managed to get two achievements and then got stuck it the bell tower, but from reading below it looks like that's a known bug. I agree with some of the other comments that subtitles would have been nice, but I think I was able to understand everything. Cool start to a game though! If there was one thing I think it could use it would be a checkpoint or save system.
You can watch my playthrough below for some more feedback!