Dude, what the hell? 100 hits to kill the boss? I could understand it if it was a RPG or something, but that was a really bad choice. And the reward for beating the boss? The game closes.
I'm sorry, but I really didn't like your game.
Although, it wasn't all bad. The wall jumping was good, and you could have expanded upon that, and focused more on the platforming. The jump sound effect gets repetitive and the graphics are ok.
Some suggestions: 1) Don't make the enemies "bullet sponges". Make them jump, shoot, dash, change directions. 2) Play test your game. I don't think that you would like to play a game where you have to lock the enemies at the border of the level and hit him 100 times to kill it.
I'm sorry for being harsh, but I hope you take my criticism and improve yourself upon it.