I like the idea of the game, and also the fact that the tutorial could be played separately, an awesome feature for hurried testers! Furthermore, your game (out of the 12 I've already played), is the first one to have audio :D. The game was pretty hard though, and pinpointing the bones was a hell of a struggle, you should increase their hitboxes! It seems to me too, that your viewport is going out of scale in the web version. Here is what I recommend:
In the project settings:
-go to window
-set the stretch mode to 2d
-set the aspect to "keep"
this way the window will fill the screen and keep its aspect ratio around your viewport!
Overall, I gave this 3 star engagement (for its difficulty), but 4 star polish, an awesome effort!