Um... good, could be better, but not bad.
I give you an eight cause the buttons' display pictures could've been better and perhaps the damage done could've been displayed on screen, but otherwise it seemed really good to me. The facts that if you keep healing yourself Mario's health can peak at over 100 and that the Goomba seems to have infinite health are both awesome and horrifying at the same time, though I dunno if that was done purposely or not, so I will not use that in scoring. You might have something really great if you improve upon the previously mentioned things as well as perhaps implementing a button press system rather than a click system (click system gets confusing in a way (dunno whether to click on Mario, the enemy, or anywhere)) Overall, more than decent, but there's room to improve.