The game is not bad. I love the graphic, i love the sprites, i love the graphic of the boxes and the system of the battle. But the game is really short, and when you finish it, it happens nothing. The music of the background is nice but it is not right for the battle: i would prefer an harsh music, but this is my personal opinion. The enemy hits the slime in very fast way, you haven't time to hit the enemy or to flee away or use the items.
Anyway, the game is nice. The game could be better if you create an story, another levels, boss, and you make the attack's enemy less rapid.
my vote: 7/10.
Good luck for this or next games.
ps: sorry about my english, I am italian.