Ahh, minecraft in 2D with a twist. Just as I was getting worried that I won't ever be able to climb back up out of the cave, the tide came and I thought that was a good idea. I wasn't able to get up to the surface though.
Music was very good, and I also appreciated the fact that the level generation was at least partially procedural. I think there's some ambition put in it, technically, and it may turn out to be an interesting game if you decide to develop it further.