...well...a couple of the advanced bonus levels are worth it. The actual game has little to no decent puzzle solving skills involved at all.
Just beat the last advanced level. I can honestly say it was the only level I got stuck on at any point. ...and only because I didn't see some portal-able walls for a few minutes, so I beat it in a way I didn't even need to...
However, I very much look forward to custom levels for this game. It has loads of potential, and Flea loves puzzles.