I like the effects of the fireballs and how they affect the terrain. SFX was pretty good too. The text at the top was a nice touch
Now for some criticism :)
- It's a shame there's no browser version. Did you try OpenGL ES 2.0 or 3.0? (2.0 is recommended for web games)
- Making it local co-op decreases your available audience. (Luckily I had someone around that I could grab to play against)
- An AI would have been nice (but could be time-consuming)
- Failing to cast a fireball while still having time left felt a bit harsh. (Could be made optional with a setting on the Menu)
- There were a few typos but the only one that mattered to me was that both players were often labelled P1!