While I personally have no strong feelings one way or another about this set, I think its worth saying this much. I dont think there is any need nor want for a mix and match/gradient keycap set of this nature in this hobby and I don't think something with this much variation is viable, however I think with some more structure it may be. Let me elaborate.
From what I can tell based on the name and the colour choices, you have a general theme but no real reference or structure to the set, when I look at this I dont think "that looks like a marina" nor does it remind me of anything really, it feels like it has no theme or purpose, there is no solid connection between any colour choices imo.
If you were to put together a set with a strong thematic reference and good coherence, that is to say, all your colours and divisions make sense next to each other, I think you could definitely pull off a set like this. But as it stands I think the execution is rather poor. Hope that's helpful.