Another way to kill him: after making him sleep, light the candle with the cigar and go to the bedroom. Click the lit candle on the bed sheets. Cheers! :)
What if the boards are in groups? And the total dps of a specific group is shown, though you'll still be able to open the groups or maybe a merge button that merges fully upgraded boards and just multiplies their dps by x1, x2, etc.
 "One Step Back"){kind=icon}
 "Idle Sword"){kind=icon}
 "Reincarnation: All Hallow's Evil"){kind=icon}
 "AdVenture Capitalist"){kind=icon}
 "Idleplex"){kind=icon}