Uranium-236

You've got to be gentle with the reactor. Hold down your mouse, wriggle a bit and the core will go critical in seconds. Instead, keep feeding neutrons to the core calmly and you'll have power 'till Christmas! - Some nuclear technician, somewhere, probably.

How much power can you produce before you blow up the reactor?

https://ldjam.com/events/ludum-dare/49/uranium-236