IT'S A TYPING GAME FOR THOSE WHO DON'T CATCH ON AS FAST AS THE AVERAGE I KNOW OF!!
Big surprise for me, too, actually.

Pros:

It had something many viewers [that i know of] like: ninjas. That's the only thing that gave this a replay value, in my opinion. If this was killing turtles with a stick, I doubt I'd play.

Good coloring

Nice "plot" [being a lone samurai against a bunch of ninjas and all]
Good ideas [the skills, how you develop their levels, etc etc]

Cons:

Apparantly, someone had a typing speed of 120 WPM, and he still had to slow down; you should know how I felt, then, considering I have over 200 WPM; in other words, those who have typing speeds that are faster than the average YOU appear to know of [this knowledge is based off your replies when you'd mention "some people"] are partially screwed, since they have to slow down their typing speed to kill ninjas. Well, not exactly; if you slow down, the max speed you can kill a nin is 0.2 seconds. If you don't and go too fast, 0.3 seconds, not that big of a deal but when there's a horde, it is. And no, I'm not lagging.

The shuriken ninjas are still a pain.
Arrow keys + space bar delays are too huge. I press too fast, it's terrible.
You know the times you have to tap left and right really quickly, or up? Well, I doubt anyone notices, but if you tap it too quickly, it moves way below half of the original, meanwhile when I tapped left and right in what I considered slow, it went interestingly quick.

Also, quit mentioning "try hard mode." Anyone can see "easy, medium" and "hard." When people find the game too easy, and it's a game like this, expect them to have tried hard mode already.

I did hardmode, and I never needed the powers. EVER. Rather than gesturing you'll put what commenters say into consideration, you're suggesting things that the commenters most likely already did.

And yeah, the glitch where the undead ninja flash bombs is still there, and it sucks.

Music could have had more variety,
visual effects were quite decent and easy on the eyes,
gameplay needs some working on as it has a lot of flaws, especially delay. [Also, boost the amount of time a combo can be continued; half a second to two seconds would be fine. Yes, I'm on hard mode. Hard mode survival is what I'm referring to. Hard Mode New Game, the last stage was JUST RIGHT, in my opinion]

Oh yeah, and when you make a typo, it doesn't seem to register that fact. Not really gonna help typing, if you ask me, and probably make it worse, but that's not too big of a problem, I suppose.

I consider this a game that's pretty average. Has potential. Perhaps you should consider adding an "IMPOSSIBLE" mode for those who want to type a lot, because I had to take a lot of breaks while killing ninjas. Anyone with at least 120 WPM typing should be capable of killing a ninja in around 0.1 seconds.

Note: My computer's just fine, so don't reply mentioning my computer.

One last thing: about that highscore table.... "the last 10 days" and "all time" seem to be screwed up. I got 2nd place in all-time with 260,000 score [the guy above me had 3 million... that must have eaten some time, no?] in "All Time," yet when I looked at "The Last 10 Days," I got fourth place, with some people on the 300,000's ahead of me [but nobody had anything close to 3 million! Not even 400,000]
Might want to check on that, or perhaps it's just my internet browser [firefox, not maximized].

"Wow, that was very creative. Even the formatting is creative.

*Spoilers if you haven't watched it yet*

LMAO! Dandruff? And next to Chaos, that was Loki, my favorite. Quite smart/creative, in my opinion. After all, people PLAY ON servers, and Chaos is a server, so is Loki, so is Iris, [official servers] and they're based on real people, so I assume everyone in that WoE just now were in "Chaos server" =P

WE ARE PRONTERA!!"

Wow, that was very creative. Even the formatting is creative.

*Spoilers if you haven't watched it yet*

LMAO! Dandruff? And next to Chaos, that was Loki, my favorite. Quite smart/creative, in my opinion. After all, people PLAY ON servers, and Chaos is a server, so is Loki, so is Iris, [official servers] and they're based on real people, so I assume everyone in that WoE just now were in "Chaos server" =P

WE ARE PRONTERA!!