Basically title.

As mentioned in the description, I removed the default world generation as it was not configurable in any way, and did not suit my needs.
Please feel free to use another mod such as https://mods.factorio.com/mod/IslandStart to generate an island world, or make your own version of the mod and copy the world generation logic from the previous versions.

Well, it makes a circle of water, but you can landfill to the edge of the pond. With SeaBlock (and its derivatives), there is no edge.

I see your point, this is because it only fills in the starting area with water.
Generating a world with the default map settings will result in the pond you mention, and the "normal" map around it.
I highly recommend as per my last post to use a different mod such as IslandStart to generate a world with islands, instead of the default world.
If I find some time I will see that I can add a mod setting to generate a proper SeaBlock world without any other mods.
Thanks for your feedback.

I have uploaded a new version 0.2.2 whereby I have re-added the old island world generation present in the previous versions of OmniIsland as a mod setting, enabled by default. This setting generates a world very similar to other SeaBlock mods.

Thanks.