Lunistice

A hidden gem. Well made relaxing 3D platformer, a combination of jumps, climbing, sliding and running but never frustrating, and you can do triple jumps, even 4 jumps when you unlock the birdie character. The devs know how to create levels with challenging yet not too much, all the monsters are one-hit kills, but your character got 3 lives and the checkpoint are not far, so basically this is a mistake-tolerant game.
I especially enjoy the cake-candy and crystal world, tbh each world is unique and interesting in its own way. In later levels some jumps can be tricky because the platforms/blocks appear/vanish on a timely basis, player needs to calculate the beats to pass certain areas. If you like to explore you'll always find hidden letters in more challenging paths, but if you only focus on the finish line it's perfectly okay. When the game is beaten for the first time, 2 more characters with unique abilities will be unlocked to offer huge replay value.
For me this game is totally worth $4.99, I highly recommend it.
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A stellar indie platformer that went under the radar. I would strongly recommend this if you enjoy games in the same vein of Sonic and are looking for a nice game to just vibe on for cheap.

One of the first games I really sunk into when I got my Steam Deck. Really great platforming, fantastic soundtrack too,

Awesome little game. Simple but very tight controls, hella charming old school graphics, and fun level design. The game is fairly relaxing and not too punishing, except for the baking world that made me rage with much vigor. (in a fun way. mostly.)
By default you have kind of a wide turning radius, but there's an option in settings that makes movement feel much better. Its called quick turning or something like that.
With overwhelmingly positive reviews I cant exactly call Lunistice underrated, however it does seem fairly little known. It deserves a strong recommendation for anyone with an interest in the genre, and for everyone else it's cheap, short and accessible enough to be an easy yes as well.

Fun little game with good platforming. My main critique is that levels are very linear and it's often difficult to tell which branching path is the "main" path and which one holds the secrets. That's an issue since often it's a guessing game and you often can't backtrack.

A bang for your buck 3D platformer at an inexpensive price.
The gameplay reminds me of Sonic and Mario Galaxy with how the environments are and how the stages are paced. It was a bit frustrating at first but enabling shadows and messing with the smooth turning option helped out a lot for the rest of the game, especially in those tight turns and platforms. What killed me the most was overshooting jumps and falling off slippery ledges. The momentum could be better but you get used to it as you play.
The enemies are cute but they do have the same designs per stage except at the end. They're pretty simple, you pretty much just run at them then press attack.
It has collect-a-thon mechanics in cranes and letter blocks which help make the stages more engaging but some cranes are only present in branching paths where the letter blocks are. The stages also have hidden stuff which contribute to the later half of the game too, without getting into much spoilers.
Otherwise, it's a quick game to finish. I believe my first playthrough ended around the 2 hour mark with the rest being the other characters and just completing the collectibles. It's a great game in short bursts and the replay value is definitely present here. My only gripes are some branching paths which can be difficult to spot at first unless you look for them and the Autumn stage which hurts my eyes when I look at the skybox.
Rounding it out at quite a low price tag, keep this game on your radar if you're a fan of 3D platformers in general. If you're looking to kick back and relax, pick it up! It won't hurt your wallet and its definitely worth your time.

Quirky platformer with a neat little story in the background charming PS1 graphics and a lot of Sonic Adventure style gameplay with really smooth platforming and neat environments. Soundtrack is also a banger.
Worst thing I can say about this game is I wish it could last a little longer, maybe one more world? But at 5 bucks it's an awesome grab to play through an evening.