First off - love the game, great job!
I was curious - I found a chant phrase in the green slime dungeon, and in the blue slime dungeon there's a hole that has some plaques next to it. I thought that you might need mana to do another explosion but that didn't work. Is there a way to open that, or has it not been implemented yet?
And is there anything hidden in the red slime cave? I tried searching around it but I don't think I found anything.