I really liked this game!
The idea of a platformer where you have to die at it's core is not very original, but you clearly gave it your own flavour. I haven't seen anyone else implement it in the way you did!
In most of these platformers, it's not really a challenge to die, since you can just always go back to the spikes or hole. I think making the camera scroll through the level was a really clever finding!
This way you had to rush to an obstacle to die of it as much as possible, before it was out of the screen.
You also set some nice traps, where I died, and then spawn in 3 hearts and in my panic grab all three of them ;)
To improve the game I would add some kind of main menu, so the game does not start inmediately.
Also I would add some endscreen with the possibility to restart and try to get a higher score (via this main menu?), so you don't have to refresh the page if you want to play another time.
Great game, well done!