These are some bad things in my opinion:
Summer Island 1:There's a level edit (gap you can duck + Banzai Bill),then there's this boring,berry-collecting field of nothingness.Then,there a vine and invisible coin blocks.You could hit the invisible coin blocks,so you climb without losing Yoshi,but it took me a few tries to get it without Yoshi falling.
Summer Island 2:The first part is just a lot of cement blocks.Then if you take the star,there's this really broken way to get lives.Then,invisble coin blocks again.To make it into the rope,you could Yoshi jump,or you could Bullet Bill jump.Of course i bullet bill jumped,because i didn't want to lose my Yoshi.After that,it's over.Really short.
Summer Island 3:Level edits,too short.That's all.
Summer Island 4:I know it's incomplete,but you could have donemore than just putting gaps.Also,this level was attacked by Cutoffnessman!
Summer Island 5:See above.
Summer Secret:See above.
Iggy's Tower:It's not even a tower.You just removed the fences and the ceiling.
Hilltop Resort 1:Broken way to get lives,broken way to lose lives.Also,TEST level=NO!(for me,at least
Why is the vault an evil castle of doom? o.O
But i like the OW,custom blocks and NPC's.