I must say the game is pretty fun. But the comment below (or above) explains it all, I played it fully on phone, so it made it even harder, but it's still plausible. The flying levels in world 6 are INSANE, and require perfect movements throught the level.
There are some custom graphics and stuff, but most of the game is vanilla. I must admit though, the end of the game is very frustrating with the level using a weird wind feature that might be explained but is not understandable out of Japan.
I'll give this one a 4/5 even with the things that I've pointed out because the game is pretty fun, and can be funny at times. (not really)
The first of several collaboration hacks created by the Japanese 2chan community.
Visually, this hack is vanilla for the most part, but there are a couple levels with custom and imported graphics here and there--not to mention the cement blocks throughout this hack were replaced with a gray-colored SMB1 block, which admittedly feels a bit off due to the lack of outlines that SMW's graphics normally have. Sprites, on the other hand, have been reskinned for the most part to resemble various 2chan ASCII figures and jokes (such as Banzai Bill Clinton).
This hack is tagged nsfw for a reason... let's just say the Chuck and Magikoopa reskins like to let it hang out.
Being designed before the days of AddMusic, there is no custom music to speak of (The old SMAS pack wasn't used here).
Now onto the level design. Because this is a collaboration hack, the style and design can vary considerably with each level. A lot of levels are pretty typical, straightforward, and easy for the most part, often with some silly theme to it. That is about 75% of the hack and it can be fun at times.
The other 25%, however, which you will find from the end of the sixth world onward and the special zone, are insanely tough. From cape flying levels that demand very good button timings to ASM gimmicks that are introduced very poorly by expecting the player to figure them out quickly, there are some incredibly rage-inducing levels waiting for those who play the hack to the end. To top of that, glitch abuse is required to finding several exits in this hack, and there are some really cryptic obstacles and secrets too--the language barrier probably doesn't help in this regard, as it is possible there might be some clues if you could read that text. I can understand why MoltovMarioWorld gave up on LPing this series of hacks.
If you're looking for a hack with some weirdness to its level design, give this a go. Though I'm pretty sure you might get more out of this hack with an understanding of the Japanese language and 2chan culture, as there are probably a lot of references in there too.