Very cheeky using the portal gun design lol! I love the idea of placing fans and puzzle solving afterwards. I can already think of so many things you add to this concept, Like imagine one of the fans could be an intake or exhaust fan that sucks things in rather than blowing things outwards! This ruled, keep working at it!
If I had any critiques, for me (maybe for my monitor specifically), the levels were to dark for me to immediate find the ways of progression. But nonetheless, I loved the ideas here!
btw, if you got a bit of free time, maybe go check out my game lol