The game looks very nice and the idea is interesting, but I can’t do anything actually. Just a second after I capture someone, there’s some Tchz! sound and the sinner is gone. Probably, other sinners collide with me.
The time you have to click an eye depends on the sinner's health and any upgrades you've purchased. If the sinner has 1 HP, you have 1 second for each eye without any upgrades. I've written about this in the opening dialogue, in the game description, and in the two "how to play" panels.