Salamander is a challenge between difficulty and ostination.
After having accumulated lots of power up's with ease, the real game starts when you penetrate an organic space environment, riddled with swinging paws suddenly emerging from what look like walls made out of pinky gums. Learn to position yourself in order to strike the weak spots that each swinging paw has and shows, and you'll be able to get past this section with frequent success.
The next bit of space cavern is little more engaging. The passages become terribly narrow and you're at the mercy of strange protruding entities, shooting strange organic bullets at different speed, in an irregular way - which means you need to improve your reflexes, your technique... and your luck. This point is the first big obstacle. It took me dozens and dozens of attempts, before being able to get past it, and some other dozens before being able to get past it with a certain frequency - only to find myself back into the gummy environment, this time offering giant fangs moving in and out of the superior and inferior walls, creating another very-hard-to-pass moment. After a while, obstination lost it belligerence, and difficulty won. But maybe if you insist...