I have now added controls to the game page.
As for the life display, it's very much just the limitations of GB Studio right now. There's no simple way to just arbitrarily show a number other than dialogues. Potentially it could be a graphical bar somewhere, but this would have to be done with multiple sprites/actors and those limits are already pushed by the tileset and large sprites I already use.
The controls are not included because it is essentially a Game Boy game, and in practice they would be obvious, right. Just not on web! But yeah, it's on the page now anyway! I don't even know that J was meant to do anything, either! It's Z, X and Arrows. 0.o