Absolutely mind-bending. Once I first saw that you can put portal blocks through other portal blocks and copy the spaces inside of those blocks was when I really became aware of the scope of the puzzles on display here.

It reminds me a lot of Portal, tbh. Not necessarily for the mechanics, so much as how those mechanics make you look at everything around yourself a bit differently with that added context. I like puzzle games for that reason, even if I'm not very good at them.