The blue blocks are supposed to be water droplets (and they do at least look like a fountain when the game is running). They look awful because they’re being textured with the blue roof texture but it works!
Plus, I’m really liking the circle of colored stars around the cursor that denotes the range of your spells. The current spell selected is Lightning Bolt, which has a small range but as you choose different spells the circle gets larger or smaller.
Oh, and bonus points to anyone who can name what movie the title of this post is referencing.