I am also excited to see the option for player content and will probably spend the next week making things. I've already spent 30 hours playing and for the price I paid all I can say is thank you.
Thanks a lot for making my day with your lovely comments; at times I am flooded in bug reports and a message like yours is exactly what I need to keep going... so thanks!
And I indeed take suggestions! In fact, I get 10+ lists of feature requests every day on various platforms, and I study them all in detail. Your ideas are very interesting! Without making any promises, more flexibility in the sandbox map is indeed often requested and an idea I really like, and aquatic life is the most requested feature by far ever :P.