I write it there to not discourage people to play and rate your game but there is not really breaking bugs however. I use Unity too. The player sword seems to have collision detection troubles, sometimes it needs a lot of hits to kill a guy (especially when they are very close): you certainly just need to choose in the inspector of the sword : rigibody-> collision detection-> continuous (or try all the other kind of detection if it not works). Probably the same trouble with ninja stars that go throw walls (Always with fast objects) and the same solution. And If you don't want auto-guided ninja stars , you need to calculate the player direction only once ( in a Star() for example), but maybe you don't want :) . Good luck for your games this one is very nice.
PS: A lot of Jam's discords have an help section: you should try.