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The efficiency drops off the higher you try to boost it. 18V worked for me 5V to 36V might be too much.This circuit isn't appropriate for reducing voltage. A transformer-based power supply would probably be better of 220->36V. Dealing with 220V is dangerous; you should consult an expert (or become one!).
Thanks for the tip; when I started out, I didn't realise how important the high frequency would be and I was too lazy to add a crystal :-)
The code is in the instructable with a link to the github page. It's for an ATTiny84, which is pretty close to an 85.
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I had a similar issue of where to put a switch when I was building an LED fireflies-in-a-jar project. I ended up putting a jiggle switch inside; shake the jar to wake up the fireflies
My number one recommendation is to start simple. Break the problem down into a few pieces and solve each one separately then think about how to combine them. You might want to start by reading a voltage using an analog input and writing that to the serial console.Then try the other half of the circuit, try outputting a pulsed signal at a fixed rate.Then put that together with the analog part of the circuit; you should be able to adjust the output voltage by changing the pulse rate.Then start to put those pieces together and control the rate from the analog input. One note: my code is for a more basic chip. It should be a lot easier to program an Arduino to do PWN and to read the input. Look up analogRead and analogWrite.
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