People have always have a fascination for zombies, either because its the most realistic horror monster or people can't imagine the apocalypse beginning with anything else than the undead.
The idea of facing zombies in a arena against some other strong adversary or just a joke match up touches many of us and ninjas seem to take the spotlight most of the time what with their unmatched speed, agility and precision.
Onto the first thing we see, the menu. It is very simple and has nice eye candy to it, I thank the artist for their simple style and dynamic depth.
Now for game play, the game quickly tells you almost everything in the game, except for the double and wall jump which could prove trouble but I was able to learn the controls quickly so I can't remove stars on that.
The game is simple, you play a ninja with 2 attacks and must use your speed and accuracy to take out the many zombies and flying skulls. These are ok, but the game lacks enough good mechanics to make these two moves interesting or flexible when zombies start swarming (Especially the skulls.) My answer here would be to add combinations like using the arrows and awsd keys to angle the shurikens and create multiple sword manoeuvres to make combating the enemy more fun and open.
The movement was fast yet easy to control, however I think double jump should be removed for a more powerful single jump and better wall jumping, I believe the wall fall should be slower at first and move faster when you spend too long on the wall to punish slower players, the current speed is not enough I feel. Next there should be an animation when moving down the wall like a smoke trail and a burst of smoke when jumping from the wall and floor to give a more feel of power to jumps. The attacks could also use some work, the swords and shurikens could have delays on them to make combos and movement seem much more interesting and useful (An example would be making shurikens have a slower delay but shooting multiple projectiles like 3 shurikens behind one another in a quick burst)
The graphics and animations in the game are a different story. I can see you worked hard on the sprites, but it just seems bland, the zombies look too similar even with the different types with one another, trying a darker green tone could help make them look more dead which you want more then a "mutant" look they currently sport. Secondly the zombies are too stiff and box like, they need to lean forward and hobble more, like they are hunchbacks. This makes them more zombie as well as clumsy and stupid. The heads are the biggest problem here with them seeming to use the same, the fatter one should have a rounded triangle look, a fat chin and neck might work with the faster zombie being more bony and ragged( Having visible hands and feet on the floor add effect, making them seem animal like and look better when they leap like a tiger.)
The skulls are most likely my point in this game, they are the hardest to take care of and appear much earlier then the easier ground zombies. Slowing them down a bit makes them less overpowered. The problem mostly is the fact that all the enemies (What I've seen so far besides the skulls) are ground based and make using the ceiling both too good and less charming since we are drawn to the floor more. Having more flying and maybe some jumping and ceiling/wall based opponents would make having to fight for the ceiling more of a needed advantage than a cheap one.
All in all the game is solid, but it needs to do more to stop itself from getting repetitive and boring.