I'd be carefull with using that amount of Water in that level, since movement in it is very slow and limiting, and it's a lot harder to aim/dodge bullets. While the idea may fit with the theme you're aiming for, but when the level gets put into practise players will probably be annoyed by the generally slow gameplay, and not have an enjoyable time playing.

Water can be put to good use if the level is made so that players aren't forced to use it to get from base to base, instead they only need to use it as an extra route which could provide them with some advantages strategically than if they took the faster route(s).

Just keep this in mind.

Forgive me if I made any typing mistakes, I'm in a bit of a hurry.