This was supposed to be ready for the NCFC, but here it is:
As you might notice, Metroids become more aggresive as you advance in the game. This gives some variety, since you'll fight a LOT of Alphas in the game. Every Metroid in the game is customized depending on the environment.
I finally found some time to code some more enemies, so I could include them in the trailer.
Also, the music tracks are the current mixes of the main tunnel and encounter themes. The second one isn't finished yet, but at least gives an idea of how it will sound.
Ok, enjoy and tell me what you think.