I was able to use the purple cube save glitch to jump on the fan and go really high up in the level; that allowed me to cheat and go anywhere.
It was a little hard to figure out where to go next after the first few areas - and I wasn't sure how to solve the tall building next to the portal. But interesting to play - keep building!

I've added a save point in the first main building (for after you find a way to get up near the fan). If you have any particular pain points where a save might be nice, let me know. Thanks!

Please put more save stones ... the space between is too great!
Especially at the beginning.