This is Outrageous Mario World demo 6.2.
Read the readme for a more thorough explanation.
I fixed the Iggy and Overworld bugs.
Demo ends at a level titled 'END OF DEMO'. fixme: music issues on accurate emulators.
The design is a good one. Here the author not only manages to use some SMW's elements for its gimmicks, but he also adds new ones. I liked the fact you have to collect 5 Yoshi coins in order to continue in castle levels. The wall-jump blocks are also nice, I just wish they were used a bit more frequently. As for the rest of the design, pretty much a traditional SMW design, kinda challengy for a first and a half world. Good work on this factor.
Aesthetics are nice as well. The author only uses vanilla elements, exgfx is only being used by some custom sprites. It's okay overall, not much to say.
As only issue, I noticed that music glitches weirdly in the first castle level and in "Skydiver Descent". A weird bug on accurate emulators, since the hack doesn't use custom music. Maybe the author used addmusic, but didn't put in any custom song.