Thank you for the feedback! Yeah, I definitely agree the mechanics of the portals should have used more. Right now, they feel more like an afterthought than a highlight. I was hoping that the use of portals would fit into the theme of "connections" but again, because they aren't really emphasized or used very much in the gameplay, perhaps there's not really a strong "connection" to the theme hehe.
I'm actually surprised to hear the game wasn't difficult enough, in the past I've had a tendency to make games too hard hehe :)