Just some C&C for you since you asked. I'm not a writer nor an English teacher, so take these with a grain of salt if you wish.

I would suggest you add in quotes for Dr. Lorenza Colzato's and Darcia Narvaez's studies, helps substantiate your claim and teachers usually love quotes (unless your teacher instructed you otherwise).
As for the studies of 22 teenage gamers at the bottom of page 2, maybe cite the actual study or the specific researcher/research group to give it more credibility.
On the last paragraph on pg 3, you might want to rephrase it say that video games cause heightened reaction in another way, rather than saying that without video games we won't have those heightened reactions; as sports and a host of other activities increase awareness and reaction time as well.
And finally at the end of page 4, you may want to show an example or supporting evidence that taxes will raise, as it is somewhat unsubstantiated in your essay.

Good job on the essay though, I would just suggest to add in hard evidence via quotes and specific studies to strengthen your argument. The more fact you have behind your argument, the better the essay. I don't know how your teacher grades, but you also may want to go through (slowly) and fix a few grammatical errors throughout the essay, as it might save you a few points (or maybe more depending on how much they like grammar). I can proofread it for you and send you a copy if you'd like me to, but there weren't really that many.

Again, I'm no English teacher, just my thoughts. Good luck with it!

Edit: Also, one thing I didn't touch on, you may want to try to split up your paragraphs even more in order to separate your arguments from each other.