I remember these styles of games--where there were no arrow marks to show where to go and you had to actually immerse (or in the least explore every wonderful tidbit) of the world yourself to find ideas where to go and uncover secrets for that tiny, yet powerful thrill of discovery. The difficulty lies in the controls and the timing--once that's down, its all in the analysis of your enemy.
You've also done great work with the fluidity of the graphics and the musical scores accompanying the scene. Great work indeed!
...However I only have one personal qualm. Bloody. Spiders. x_x
It's worth it to overcome my fear on them to finish the game but...it cost me a week of non-playing to even touch past the second zone.