Very interesting project! The art was simple, but really immersive and the music's mixed really well with the overall theme.
I just missed some way to recharge my health, since it's easy to make a simple wrong movement and loose a lot of health... I think it could be interesting if the sneeze damage had a little of vampirism in it. Recharging just a little bit of health for every hit that landed on an enemy. I don't think this would be too overpower since it's not that easy to land a lot of bullets on the enemies and it would encourage the player even more to attack with the sneeze.
I would also leave the sneeze direction for more time on screen, maybe even all the 10 seconds... Since the map is full of holes, the current 3 seconds made me play safe and slow. Because I couldn't tell if I would be in an impossible position when the sneeze direction appeared.
Overall it was a fun experience. Great tutorial and the difficulty felt right.