Hi CyberPRDX!
What an interesting mechanic! Once I realized that "syncing health" means that lighting up the dude my gaze is on is a bad idea, I had a lot of fun with the mechanic. It's also super cool that the gaze breaks when obstacles are involved. A really unique and intuitive idea!
I think one way to improve would be to have some sort of indicator that you are hurting yourself. Maybe like a pulsing particle effect that travels from your in-gaze enemy to you, before you take the damage. That way its 100% obvious its a bad idea, even without reading your description!
Overall great start to a very novel concept! Good luck in the jam!
Best,
Brandon from TheIndieDream