Suggestions that would benefit your cover in my opinion ... I will go pretty in depth and may be nitpicky but don't take it personal.These are not requirements to make a good cover its just my opinion on what i would do if i were you.
The Template itself- There is some color separation of the red SNES logo on the front and spine. There appears to be two different colors of red or a faint line running down the middle).
- Move all your text boundaries further away form the border of the box and the images on the back.
- The front gray snes logo/blinds seem to be darker than the rest of your template. I would suggest making them all the same color. Currently the front one will likely be too dark and unseeable when printed.
- Nintendo seal is too dark and gray. The seal should be more of a golden color if possible.
Tactics Ogre- Move all your text boundaries further away form the border of the box and the images on the back.
- spread the images more apart from each other (make them smaller too). Most retail images on the back have a larger areas in between each image.
- the back text is pretty small. I know you want to get a lot of info back there but it will look drastically smaller compared to retail games side by side.
Secret of Mana- Move all your text boundaries further away form the border of the box and the images on the back.
- SOM logo need to be redone. It looks like you pulled it from the ROM itself but it would greatly benefit from not being grainy/pixely.
- move the characters down a bit form the top and the logo up from the bottom. It will put more focus on the game name itself rather than the island. The logo is almost always spotlighted on each cover.
I could add more but i would just be super-nitpicking at that point

Hope this helps