A simple game.
The concept of the game was alright. I'll run through each part.
The best part of this game was aerial combat. Kicking your enemies, jumping after them, kicking them again in the air and then using your attack. It was easy enough, and it kept you safe while you attacked multiple enemies.
However, the aerial combat had a problem. When you finished your aerial attack and went to land, your kick button would make you do a slash attack before you start kicking again. This ruined any chance for multiple relaunches. Maybe a intended part, but it ruins a possible combo system.
Ground combat was much worse. The auto-guard feature doesn't fit here, and your enemies guard hits out of nowhere. It might have been better if their attacks had a short pause right after that wouldn't allow them to block. This would open them up for a counter attack. Also, sword attacks should also slightly launch the enemy if they are already in the air, so that you can get some combos with kicks.
I would like to see guard on a button. To make it really useful, pressing attack during guard would counter.
Enemies were mostly the same melee-spamming and occasional uselessly jump around grunts. Variety is spice. Make ninja bunnies attack in the air and from the air (guarding in the air would be useful here). Perhaps a ninja star, which can be reflected by attacking?
The music was good, no complaints. The graphics were exactly the same from the animation. Good job!
4/5, 8/10 for a decent game. I would love to see you make one for the 2nd part.