Short and Sweet.

Overall this wasn't bad, but it was a bit too short and lacking. So the enemy destroyed the player's first wave of monsters, but then what happens? The battle isn't won until someone's castle is destroyed, so there wasn't really a clear ending. You could always go with a sort of "Yugioh Abridged Comedy" route where the players use cards that clearly don't exist until someone wins or quits.

Other than that, the animation and character design was pretty decent. The sound effects were okay but some seemed to be slightly mistimed, and others were abnormally louder or quieter, though not enough that it took away from the movie too much. This isn't a bad start, but you can definitely do better and I look forward to seeing you improve in the future.