Here are the screenshots I promised.
The water effects were redone, the blue tint is a lot less intrusive than before.
The upper part of area 5 isn't flooded. So it looks and plays like a traditional area.
The caves right before the final area.
This is the first normal metroid you encounter in the game.
Please bear in mind that things are improving all the time. The metroid sprite is made of smaller moving sprites, and still missing the electricity effect. It looks a lot better in motion.
Testing is still going on, now also including the late areas. The two big things that are going to be the final challenges in development are the Omega and Queen metroids, specially their AI and balance.
I'll get back to coding, have a good week!