Pretty good. I like the switching between two characters. I wish the dash was explained at all. I found the red knight to be the most fun to play since he was faster. I personally don't like slower characters unless they have a real benefit to them or something unique. I like everything you made for it and the music is a nice touch. Some of the items are really fun to use.
Generally, you should explain things more with not hiding the tips behind the player and keep doing what you are doing, it has potential and can end up being a really great game.