Thanks for the kind words :)
I figured the amount of trash would be a bit of a statement about the amount of trash thrown into the ocean in real life, given there are islands the size of small countries out there. I figured letting that make a statement and forsake some playability was a good enough trade-off. An enemy would be a nice idea, but I'll be honest, I couldn't think of anything at the time. Though perhaps something to do with the business dumping the waste in the oceans might make a big impact.