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If the idea of playing a game like Space Harrier (and a bit of After Burner) interests you, you should definitely grab this.
So what does that mean? This game is a pretty standard rail shooter: your character moves forward on their own, and you control their position on the screen, to shoot enemies, lock-on enemies and avoid projectiles/obstacles as they come at you.
It's a simple game to pick up, and the difficulty can get a bit rough, particularly later on, but the game actually features a sort of skill tree to spend the stars you will earn by shooting down groups of enemies or playing some of the mini-games available to you.
This skill tree is mainly filled with extra hearts for your life gauge, as well as a ton of unlockable cosmetics for the main character, and the occasional special unlocks, like gear that protects you against enemy attacks, or the ability to slow down time. It also unlocks various bits of lore about the game's world!
Visually, the graphics themselves can feel a bit cheap, but the game's style and surreal sceneries really helps getting into it anyway. Much like Space Harrier, you'll face some odd enemies and go through strange locations. Although visibility/readability can be a bit of an issue in the latter parts of the game when enemies begin to swarm the screen, and you're not always sure how you got hit.
But of course, the music... I didn't know Valensia before this and I'm glad that I do now. Nice orchestrals pieces and a variety of vocal songs that can be described as "Queen-like", which may not seem like it, but goes very well with the game. One of the boss themes always gets me hyped.
All in all, Air Twister is a very enjoyable experience, particularly if you're fond of such old school arcade shooters, and it offers a decent amount of extra content outside of its main game, which is always nice. The asking price I feel is fair, though your mileage may vary depending on how you feel about short, arcade-like experiences.