I played this for way too long. The only issue I ran into seemed to be that you can't get MUCH more than 40 sugarcubes. I get 40, then it just fluctuates between 40 and 43 no matter how many I get. Fun times though apart from that minor gripe!
Sorry for this weird behavior. It actualy is giving you extra life whenever you reach 50 sugar by consuming small amount. That was the last moment addition so there is no proper visual or sound feedback that would explain that ;-)