Sorry for your bad experience. :(
We did make it too hard to enjoy it in ver.0.3.7.
And it's a huge challenge for us to tune a stable difficulty fit for everyone. And we are about to bring a difficulties selection in the next update.
Sharks and seagull will be less aggressive in easy mode.
And it is a bug that survivors do not stop what they are doing when commaded to do something, we'ill fix it.