Very nice! The spell system is interesting, if a bit confusing due to the two-way casting order and it was also hard for me to remember the spell costs or other requirements, resulting in a lot of trial and error. I managed to get the two runes in each portal, then continue into an enhanced portal to reach the puzzle with those ring pedestals, but at this point I'm starting to lose interest due to the complexity (if you can call it that) to try simple things, and I'm not hooked enough to continue playing.
Even though I lost interest, it's a very solid entry! Good job :D