742mph
My work is never done yet
I'm with Spiky and CobaltBW on this. The inability to cancel Super makes it less convenient, but more importantly, it makes it more interesting. Besides making you face a clever trade-off in when to activate Super, it makes the experience of using Super stand out more, because there's even more incentive than there'd otherwise be to go fast through the level and collect lots of rings. (After all, if you're moving too slowly through an area where rings are too sparse, you can't just turn Super off and then turn it back on when you've replenished your ring count a bit.) Plus, since you can collect rings more reliably when you're moving more slowly and carefully and taking detours to hidden ring monitors and such, the experience of using non-cancelable Super creates another interesting trade-off for the player. At any given moment, they have to ask themselves "Should I go fast so I can encounter more rings and finish the level before I run out, at the risk of not collecting enough rings on the way and running out anyway? Or should I slow down a bit to try and get more rings out of this area, at the risk of spending too much time here for too little gain?"