I'm glad you liked it. I definitely should have looked for sound effects before a couple days before the deadline.
As for the bugs, I just tested them out and everything seems to be working properly on my end. With the shield spells, are you referring to how they float in front of you for a few seconds before disappearing? If so, that is indended as an indicator of how long the blocking effect lasts.
As for the gamer difficulty, that is also intended. It is a difficulty feature included in hard and gamer modes. On hard, you only get to see the current input, rather than the current and the next, so that you have to know the spells a bit better. Gamer mode does not have any indicator to increase the difficulty even further, since it is intended that you should have your selected spell combinations memorized. If this seems like a bad way to increase difficulty, let me know. I can see it causing some confusion.
Thanks for the feedback and checking out the game! I'm glad you enjoyed it.
BTW, I didn't leave a comment on your game, but it is definitely one of the coolest games that was submitted.