Day 1
I made a test room with the three basic kinds of tiles (wall, floor and water) to develop the core mechanics in. I also made an enemy object and a player object. The player object can now move around the room and cast the Water Jet spell to push the oblivious enemy object around. Here's a gif!
I'm going to keep working on the magic system for now. This includes the Ice Wall spell, the Water Walk spell, a magicka bar that regens over time and UI buttons to let you pick spells. (At the moment the image of the book is all I've got in terms of UI).