The gameplay in this was very fun, and I also really liked the art. I also encountered the bug where my shurikens would not throw, but once I refreshed enough times it worked. Great job!
Happy you enjoyed it! Refreshing the game seems to do the trick for shuriken malfunctions, but this is not ideal of course. Still keep in mind this is only a protoype so far. The performance of web-games depend on the browser and this is hard to test.