One of the best.
Usually, it takes me 2 minutes to get bored of a game, but this one hooked me up for over a hour.
I just love it, finally a game where you have to think and re-think about what to do and how to do it. A perfect game to use your head and mind.
One thing that I didn't like is almost all of the monsters because they are annoying and the ones that go invisible just piss you off, but bosses were nice to fight against.
Trapped 6 would be awesome. Some suggestions would be more items, more stuff to buy, more secrets, guns that could replace bombs, more puzzles and a possibilty to save the game. And if you finish the game very fast, without taking a single scratch or simply finding a super hard secret you should get some kind of ultimate item or something else to fight that gives a reward such as cheat codes.
Good luck.