The game can be summarized as a Manga inspired offspring of Time Crisis & Virtua Cop crossed with Crazy. It's a fast-paced, skill-based RPG shooter.
Lots more info here: https://halfgeekstudios.wordpress.com/2014/08/27/ninja-legacy-reboot-now-ninja-girl-rpg-defense/
Works just fine on almost any PC/MAC that I've tested. Designed for mouse or touchscreen notebooks.
The direct download link is on my Google Drive, I'm not sure if there's a bandwidth limit on it or not, so feel free to host the ZIP file yourself and share it.
PC: https://drive.google.com/file/d/0BzblvPC-hDgxTmY1S2xhQm9UeG8/view?usp=sharing
MAC: https://drive.google.com/file/d/0BzblvPC-hDgxWWlCSjBHY0hLYWs/view?usp=sharing