You can end your turn with "space", you can confirm this with "enter". Which makes sense to quickly go trough dialogs with the keyboard without mashing spacebar.
However, the flowing things are also dialogs, but don't follow that rule:
- After island selection "continue" button.
- Confirming mission selection.
- Mission results
It would also be nice if we could skip parts of the final mission animation, the part with deploying pylons, and the bomb is really taking the speed out of the game, with all the dialog. I can see you have parts of this disabled during development, so you know how annoyingly slow it is.