Ring Racers is a gem, the somewhat lengthy tutorial and the mostly fixed single player rubber-banding won't take that away from it.
This game joins CTR in the field of kart racers that just "get it", it's very technical with a lot of inter-woven mechanics making the game a blast to play and get better at. The ring-feeding being a variant of the F-zero boost mechanic adds a lot of strategy and intense moments compared to robo kart, I love that the devs went and honed such disruptive ideas, really ends up being a breath of fresh air in the kart racing field.
On the presentation side I think the game has a pretty strong themeing which really transpires in both visuals and soundtrack, there is a staggering amount of content (like 8 times the amount of tracks in a typical new mario kart) though the circuits still managed to be highly varied but still consistent with the core theme, of course the sonic (& some sega) IP helps with its long history but the fan-service is a given in such a project and if anything makes it easier to love.
I also want to mention the single player progression which I think is really well realized, it uses a similar system to the challenge wall in smash brawl, which lets you play the game as intended but keeping side objectives in mind, it really encourages you to play more of the game and feels good feeding you rewards regularly, also have the option to skip some of the challenges if you feel like it. I also like how many secrets are hidden among the tracks, it's really fun to explore familiar areas in a new light and discover all the effort that went into them (most of them being linked to unlocks too).
Overall this is an amazing fan-project that isn't afraid to push its genre forward, both in mechanics and how it handles progression, and a beautiful love-letter to the sonic IP.

Cool game, compared to Valfaris I think the shmup formula works better for the kind of atmosphere they're trying to sell. I still feel like it lacks ambition, it's not really pushing boundaries on difficulty, spectacle (too many reused animations, enemies and patterns, not enough environmental effects despite the really cool art style) or lore (the idea of the world is cool but it's not really going in any depth about it) so it probably won't end up as too memorable. Still it's fun to play at the end of the day and they managed to make melee not feel awful in a shoot'em up so I'd recommend it if the premise sounds appealing to you.

Traditional Arcade styled kinda remix of classic Pac-Man as a platformer.
I don't think Annalynn's formula works all that well in comparison, my main issue being with the snakes (ghost equivalent). They can very often be off-screen so it's hard to track them and they have really erratic behavior, sometimes instantly turning around when you're following them to kill you but most frustrating being going through doors and popping up just on top of you. It really makes the game a lot more frustrating that it needed to be and not what I'd expect from an arcade game that shouldn't have any incentive to empty your wallet with cheap deaths.