Iron Man Guide
Do we really need a guide for this? Since all the levels are fairly straightforward, I'll just cover the levels that have some interesting talking points. All the other levels are easy to get through with no deaths if you take your time and wait for openings to progress.
20, 16, 17, 18, 19, then everything else
1-1, 1-2, 1-4, 1-5
Can't die here unless you go out of bounds.
Climbing up the first wall is the easier path to finish the level.
Only the saw part of the buzzsaws will kill you. Touching the handles is ok. This means you can safely stand on the platforms and wait for an opening to jump to the next one.
Watch out for the gear shooter that fires downwards at the beginning of the level.