After playing Wings of Vi for a good while I decided to do a proper review.
Difficulty
Usually I'd mention gameplay first, but I think the difficulty this presents will be the largest single deciding factor on whether you'll like it or not.
Wings of Vi is a very brutal experience, you'll likely find that the difficulty ramps up faster than you can learn the game, meaning you'll have to crank out repetitive grinding to overcome some areas, boss fights especially are showstoppers, as they're both tanky and spammy, so you'll need to dissect their patterns to nigh perfection if you want to progress. However Wings of Vi never pulls cheap shots, everything is approriately telegraphed so the amount of foresight required to beat obstacles is sparce, however if it's a laid back sunday platformer you're looking for, I'd look elsewhere.
Note that the game does have difficulty settings: "easy" is a lot more gratious, but by no means any kind of autowin, Grynsoft has voiced an interest in trying to soften the experience on "easy" difficulty to accomodate a broader audience though, I'll update this review if any significant progress happens on that front.
Gameplay
The platforming elements of Wings of Vi are heavily vested in both precision, timing as well as resource management: Using the right actions, at the right spots and in the right amount. You'll mainly be working with two mechanics: Jumping and fluttering. Jumping is a familiar friend and it works as you'd expect, with the exception that a lot of obstacles will require you to drop off the edge and then jump to manuveur below a platforming section, midair jumps of this sort count towards the same charge as a ground jump does, so learning the distinction of when to use one or the other becomes a vital choice. The flutter works as a sort of midair glide with a slight amount of lift, which you'll want to use when you want a greater amount of horizontal (rather than vertical) traverse.
While the platforming elements are mainly static, the combat feels somewhat more dynamic and RNG-based, where you have to learn the behaviour and patterns of enemies and react to them rather than use memorization. The boss fights have some RNG too, where which pattern (and subpattern) the boss cycles to is randomized, but the patterns themselves can be dissected and memorized in full, the boss fights are extremely engaging and fun, with a weighty feel of tension to them as you slowly and surely wear them down after having practiced the ordeal religiously.
The controls are extremely tight, midair control has a nice sweave to it, the flutter works as a counterstop, falling speed is light and feather-like, though the resource management part of the controls may feel unintuitive at first.
Stylistic Choices
The game has a very pleasant and vibrant aesthetic with sleek-lined and fluid spritework, the music has delightful chiptunes and groovy waltz, sometimes with a bit of an apocalyptic intermix, the sound work is meaty and gritty to accomodate the demonic side to the story and the dialogue is witty and charming.
Conclusion
Wings of Vi is a well-realized platformer, with tight controls, difficult but imaginative platforming and a pleasing style, it's a grand adventure through a variety of themes, a little quirky and self-ironic and shouldn't be missed by any platforming fan looking for a challenge, highly recommended.