Nice game ! fits the theme well : nobody can ignore gianormous pools of lava
I see you went for creating a sense of urgency with the potion that comes back just in time ;)
Nitpick : having to wait for the potion multiple times once you reached a platform breaks the pace of the game... maybe make it give all your health back at once on a platform ?
Also, the health restored feels really small : maybe restore more less often or make the healthbar bigger.
I also found an exploit : if you spam spacebar on a platform you can get the heal to be instantaneous until the next platform.
Cheers :)