It's a cool idea, but I think some of the reapers are not doing their job properly.
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It's 1 reaper for 1 soul; if they finish the one they're assigned to their animation will change to idling (and purple progress bar will disappear, but the bar is behind the reapers so some resolutions/scaling we didn't test for may have a harder time seeing the progress bar). When they're idling you need to click them again to re-activate them, their reaping animation and progress bar will restart :) If we had more time we would've tweaked it more for better communication with the player (and a short tutorial), but with the constraints of the jam, these notes could only be included in the instructions on the menu screen.
Thanks so much for playing! Played & rated your game as well :)