I forget what the end of stage 10 looks like. Is the the large room full of rubble or ruins? With that big demon boss?

I probably did get a game over at the worms, but I remember learning their patterns quickly. Morever, I used the flails, whose prolonged combos did a shockingly greater amount of damage to the worms than the sword. (And the windmill shuriken helped when they were out of range.)

Do you have the Dabilahro (i.e., Cloud's sword) yet?