I am not biased against short games.
In fact, I have just played two other on Newgrounds with playtime comparable to this one's and really enjoyed them.
The problem is, your game feels like an early prototype or a pet project published when one gets bored with developing it, and not as a short, self-contained experience. It just feels too short, too unsubstantial.
Being on the front page and the description don't help either.
"Explore caves, space ports, machine rooms and more. Solve puzzles and fight scary monsters. "
More like:
"Explore A cave, A space port, A machine room and THREE more rooms. Solve TWO puzzles and fight A scary monster. "
The mechanics show an ocean of potential, the sound effects are absolutely fantastic and you have nailed the way how collision-based switches should work in a 2D platformer, but treating the game as a released piece just feels like a bad joke.
PS. Was 'An Inde Game' spelled this way on purpose?