I remember being really disappointed with that. You start the game defenseless, just swimming around, then you get a dream level where you are suddenly badass. Able to rapid fire homing energy bolts. When I first came to that I though "cool, this must be a preview of near the end of the game. Very cool to get a small taste early on". Then the FIRST form I get is that energy form. Every form after that is weak by comparison. I think it would have been a better progression to get some of the weaker forms first, then energy later.
I dunno, maybe they did it on purpose since every game ever does it the other way around. But I ended up consciously not spamming energy form everywhere because it made things too easy.