The animation was good, and the fight was decently choreographed; however, the concept seems flawed. The focus on the count-down from 50 seconds makes it seem like it's the character pulling off a great feat, however, having the robot masters each explode in one shot makes it feel cheap as a result.
If you dropped the speed-run aspect, since it is ultimately meaningless, and extended the fight to have some highs and lows rather than a consistent barrage of action I feel like the fight would have been much more enjoyable.