Overcharged

A Mysterious Stranger guides you to a factory, promising you amounts of money you could only dream of if you go inside.  But the money won't be of any use to you, as the door slams shut and you only have 20 seconds to shut off the power, or a meltdown will occur! You can use slime hearts to dissolve the energized liquid powering the place, however. You can get them by killing slimes, Little creatures that run lose throughout the factory. You can't kill them directly, but lead them into energy beams to destroy them. You are immune to the beams, but the slimes can't say the same. Once you collect their hearts, deposit them into the well. The liquid will be completely dissolved once you deposit 5 hearts, but slime hearts are super valuable. Collect extra to raise your score, but don't get greedy and lose it all.