Pretty simple, but I guess it gets the job done.
Not really much to comment about this, other than that I wish the "worlds" were more visually distintict instead of all looking the same, and I also wish you had made some sort of indication on wheter you're actually taking damage or not since it's kinda hard to tell. That would also make it easier to realize that shooting consumed your health since you didn't mention that on the page, so I took a while to understand why I was suddenly dying
Anyway here's a gameplay vid (I died on the 4th round sadly)
Potions also didn't spawn once I stopped shooting, not sure if that's a bug or not lol