The game is visually cool. Tsuta's stage is by far the best, I would call it perfect if it weren't for the save placement. Cool and calming visuals mixed with a nice music, and a very original level design full of unusual jumps. Tama's stage and Mao's stage are...Good as well, but both have way more generic stuff, and I didn't enjoy them as much as I enjoyed Tsuta's stage. Tama is a bit less generic than Mao, but Mao has better visuals and a more interesting level design imo. Mao took me the most effort, although Tsuta's stage had one save that gave me plenty of trouble as well.
I really liked this game, mainly thanks to Tsuta's stage. Would recommend.
つたしん's stage honestly carries the game in my eyes; if it were a standalone game, I would most likely give it a 10/10 rating. There's literally nothing wrong with the level design. When I try to play games really quickly, I may get flustered because I can't do it like I want to; when I speedran this game, I was having too much fun in this stage to even think about getting flustered, even in the few spots where I could have played better. On top of this, I just adore the atmosphere brought about by the visuals and the music. This stage may have subconsciously influenced my style of needle heavily.
たま's stage is also amazing. The visuals, once again, are top-notch (although the music isn't quite as fitting, mostly due to the length of the track). The level design is all around really unique and really well done, even in the few spots where the difficulty curve is wonky and the needle isn't quite as unique; たま makes it so that you still have fun while doing those parts. My biggest complaint with this stage is with the save placement, which is at times questionable.
はりまぉ's stage is probably the best visually and the most aidsy in terms of level design, yet I still had a blast through it. The design is much more linear than the previous two stages, yet it still remained all around pretty interesting. There were rooms that I disliked a bit, such as the room consisting nothing but shurikens and the one room that requires a 1-frame, but as a whole it's still really fun to play through.
All stages in this have 1 common problem, though: the save hitboxes are pretty precise due to the sprites, and it makes it difficult to save at times.
As a whole, what appeals to me most about this game is just the variety you get from the needle; the fact that each stage has a unique needle style, each of which I like a lot, is really cool to me. The makers did a really good job with this all around. If you want a challenge, just play this; don't give it a second thought, just play it, I guarantee you will like it.
Would definitely play again.