Found a bug at the boss fight: one of the enemies got a knife in the ground and... at that point, it did not move and it couldn't be hit either.
Also, regarding the boss fight: with Miranda's strategy of jumping high and being out of range for being attacked most of the fight, each hit had to count, so, special moves were the choice...
...so to win the fight without it taking too ling too much, my strategy ended up being: lose a life, and use the new special bar to unleash all the specials on her : p Maybe she could jump less, or more enemies could show up allowing the player to fill the special bar more?