Okay, it was a bit painful but eventually I got through it. I found two spells, but only by luck and perserverance bordering on obsession, because the font is very very hard to miss and small and doesn't stand out in any way.
To save others the trouble, the spells are:
CENTER-NE-E -> Fire spell
CENTER-SW-W -> Ice spell
I dunno if there are others, but these will be enough to get you to the end.
Good graphics and music and concept otherwise. The main mechanic being hidden in this pixel-hunt however dragged the game down :(