OK, if you want some spoilers we have them for you
Advice #1, universal (would do you well on any level. Do master combo more often. Try to do at least a master combo with 4 hits, which is the easiest to do, but it gives you FOUR times the damage output on the last hit.
How to do it - look into the help.
1st hit - diagonal from top right to bottom low,
2nd hit - diagonal from top left to bottom right,
3rd hit - from top down
4th hit - from top down again
Advice #2. When entering second room try to activate the fire trap asap. Good chance is that fat guy is at the trap at this moment. More important than damage he gets is that he drops a great mace - battle hammer with 230 damage and Breton shield. Get them leaving him helpless.
Advice #3. When getting up into the 3-rd room, instead of attacking thin guy who comes to you, run to the fat one who is busy fighting his standard opponnent and do a couple of master strikes at his back while he is busy. This also adds to the lifespan of a standard guy who would keep hitting the fat one giving us help.
Guys. the game is NOT a simple swipper. Try to work out strategy for every level. This is how it was designed. Hope you enjoy your hard earned victory!!!