lmfao, well I've actually turned my computer off several times in the past few weeks! Are you kidding? That f***ing dev
You get this ridiculous amount of candies after killing the dev. It's pretty cheap, though. Super easy to cheat at, but I only did that after finishing the dev level.
Hell is supposed to be hard, but an Imp can go a long way once the ghosts start showing up. If you have the unicorn horn you can get to the devil with full health.