The toggled blocks are a bit janky atm aye, sorry I didn't have time to program in a little fix for when you get stuck.
Rushing through is intended, and the way back to the start is the same way you came. I will say this first demo is a little more challenging than a tutorial ought to be but that's mainly cause I didn't have time to seperate it into 2 levels that build off eachother.
I hope you'll try again if it ever strikes your fancy, and in any case look toward future updates. Feedback like this helps improve future versions!