After getting a bunch of feedback from a ton of people, I decided to implement some changes in order to make the game a bit more dynamic.
Changelog:

• Added a possibility for standing ninjas to throw shurikens, which you can only block, and are immune to your own shuriken attacks

• Changed the sprite for Ryuusei’s shuriken

• Made the game window adjustable

• Added a sound effect for the enemy shuriken

• Made the screen go red when an enemy shuriken hits you

• (Forgot to add this, but will in next release) You can now press escape and click on the exit button in the menu to exit the game

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Please help me make Shuriken the best game possible by giving me feedback and telling other people about the game! If anyone beats the current world record of 205 points (it changed due to the patch), I will give them an honorable mention :)

Thank you to everyone, and happy playing!