I was thinking about the sword, but it's supposed to be a stealth game, so I don't want to give the player an easy way to cut down every enemy and not even worry about stealth, y'know? That being said, there's going to be several tools for the player to use instead, like ninja stars, tranquilizer darts, even some magic. One spell I have in mind would let you become an enemy, so if you become a samurai... well, there's your sword.
And hands do magically appear when you need them -- hanging off of ledges, throwing ninja stars -- but I've become attached to the basic ninja being a blob.
I do agree about it being overly green, I had that concern too. More trees would help, but I feel I need to do more than that... I'll definitely be adding some more small touches like flowers, maybe fruit on the trees, maybe little birds flying through occasionally... Again, those will help, but I dunno if it'll be enough. If anyone has any ideas about that, please let me know!