Kind of a boring and unimpressive hack. Levels are often empty and you would think they're tileset tests because they look and play like them. Some levels have no enemies until towards the end, and some levels don't try to play ideas on you until after you cross the midway point. It feels like a lot of filler, but in the thinnest bread.
It pisses me off that the castle drops you off at the middle of the level rather than the beginning - I flew back to the start of the level thinking it was something special if you'd brought the cape only to be blindsided by the fact that it was a design error. Furthermore, the Red Switch Palace isn't even edited and half the levels aren't renamed. There's no proofreading in the text, as it's full of spelling errors and missing letters.
There's an unfinished level in the pipe hidden off-screen, after you beat the castle, that's riddled with Map16 annoyances. It could've been an "end of demo level" that allowed you to exit through the sides without proceeding. The level itself is slope spam, much like the second level of the hack, except it has areas where you can blindly jump onto a spiky enemy. That second level of the hack too has a weird glitch that happens here which goes away after you re-enter the screen. Sprite tile memory errors also occur in Watch Out for Lakitu, which often cause shells to go invisible. The title screen is badly designed, as layer 3 menu text chops through the subtitle.
There's a really cool and difficult challenge in this hack though and I'm not sure if the author even intended it. If you don't have the cape, I strongly recommend trying to get the secret exit in Watch Out For Lakitu like I stupidly did. Timing is critical on when you kill Lakitu since you have to do it just before the sprite that causes him to despawn, and you have to run and jump into the cloud to make it go fast enough, then you have to catch up to it and jump onto it over a wide pit while dodging some aggravatingly-placed enemies. Sounds easier than it is. This is by far the most exciting and fruit-smashing thing this otherwise very easy hack has to offer, and I'm not sure it's enough to warrant giving it one more point than I've given it.