Going just to be honest but i personally found the game very rough and it had a lot of mistakes in it such as glitchy animations, being hit before they landed and also the red unreal arrow.
I think the idea of the game could work well as arena boss fights can be fun and the shop the way it open up is neat idea. The music good and fit game well, also your character model and boss models was nice too.
But because the problems such stiff gameplay and the faults I did not enjoy it that much. Also you really needed to add a restart button to menu instead just quit to desktop.
I dont mean to be overharsh, i do think your game idea was quite good it proable just very big for the short time and I wish you luck on it I think with some work on the problems and better animations it would become a good game.