Good game so far, but there was one major issue: when you run into a mermaid that gives you air, the [make for surface] and [dive deeper] buttons don't come back after the event, leaving you stuck on that screen
Thanks for letting me know! If this happens, you can press P, as instructed in the readme document, to try and reload the action buttons. Sorry for the trouble, I'll try to get a patched version up for download soon.
I went over the code and figured out what was causing the issue you encountered. I just released a new version, which you can download from the game page, which should resolve the bug.