It was boring up until the slime guy, and Thwomp and Bob-omb King could have been designed better (they were too repetitive). However, the other matches were quite cool.
I do have some problems with the engine, though. When Mario gets knocked down, he stays down so long that it gets frustrating. Also, Mario will throw the snowball in some very weird directions, including backwards, when jumping.
Spoilers:
| As for the fight with Klobber, I have no clue what was going on or what the health bar was for. |
All in all, I wouldn't mind seeing this as a full game with more people to fight.