Perhaps you should work together with a programmer
First of all, the presentation of this game is excelent. It looks great, the music is fitting and I really like the black&white style.
However, the programming could have been a lot better. Some things are just the choices you made, like the way to jump, or the fact that you continue to glide a short distance after stopping (I fell onto a lot of spikes because I slipped of a platform. It got rather anoying.), but perhaps you should change that in possible further versions. Other things are simply programmed badly. the screen turning black for a second, and I'm suddenly somewhere else, going through floors and walls and enemys that sometimes have strange behaviour, are not that easely overlooked, and kind of break an otherwise good game.
Also, Perhaps it should be a bit more difficult. Espicially if you have the tunder sword, the game is to easy (one special sword move to kill a boss is just to much)