Hi there! Apologies for the lack of clarity on how different player states (as I call them) worked, I'll work harder to make that more clear in-game in the future. In the meantime, it's like this:
Magic/Health is greater than 100%: Powered up state! Move faster, but health/magic drains faster as you're kind of in a careless overdrive mode. Would have been a greater attack range too, but game jam time constraints and my poor planning meant I didn't implement that.
Magic/Health is less than 10%: Survival state! Move faster, no longer need to hold attack key, but enemies will still hurt you (also I think I made health/magic drain slightly slower so you have a better chance of coming back from it).
In both states different from the norm, all people/enemies are automatically alerted to you, think you're dangerous, and run away or run towards you.
Hope that clears it up a bit, and I'm glad that you liked the writing! Thanks for playing the game and messing about with my wonderfully spaced-out vampire!