The game would benefit immensely from a playable tutorial and adjustable difficulty settings. Dairojo! Samurai Defenders is daunting, to put it mildly, but if you're up for a lesson in tough-as-nails tower defense, then get your katana ready.
The gameplay is simple enough to understand and it works rather well for what it does. I just wish there was some sort of tutorial level or maybe an introduction story mode that eased you into the gameplay rather than pushing you headfirst into the fray.