Beat the whole thing in 2.4 hours. I would say it's one of my favorite puzzle platformers. As always with games like this, it's not easy to describe what makes it fun - the game as a whole is just designed in a way that it's pleasant, relaxing. and entertaining through the whole game. At no time in the game did I not enjoy myself, so however short you think it may be, you're in for a really good time throughout the whole game. I'll do my best to try to explain why it's so good.
The experimental jazz soundtrack combined with the nature soundtrack is done very well. If you're used to the typical indie game mistake where you have a blastingly loud short chiptune loop that's played all the time, you're in for a breath of fresh air. It's as relaxing in the same way as going to a secluded beach or forest trail. It invites you into a mindset that helps you appreciate the minimalist art style even more. You won't be getting listening fatigue from this. The sound effects for every interaction sound great, too. I especially like the sound the ball makes when it clinks into things. It's just very polished and pleasant all around on this front.
Unlike more chaotic physics platformers like Gish, you never feel like you're being cheated out of success or struggling due to the random nature of the physics. They give you a great amount of control over the ball - the ability to switch to a high-traction or high-speed mode makes it very precise. I never felt like the ball wouldn't do what I want - you do have to keep in mind that there's no air control though, something that you might have trained into yourself from playing other standard platformers. The game also features several levels with a wide variety of vehicles, and levels where you can't even control the ball but control elements in each stage. Those are also fun to interact with and add fun variety. Overall, I found the gameplay to be a perfect level of challenge throughout. Each of the levels is a small, self-contained puzzle. When you die, you restart from the beginning of the level. This makes death hardly frustrating at all - you just get another chance to try what you messed up on instead of having to go through a whole bunch of stuff you already solved and are bored with. The challenge towards the end, where you have to collect stars by replaying levels and searching for them, is also not as frustrating as you might expect. It's usually pretty obvious where stars might be (and it tells you which stages have unfound stars), and the levels are so small that you really don't have to search far.
The visuals are very easy on the eyes and very easy to parse while also being beautiful. Just the simple gradient and other small details enhance the relaxing aesthetc.
In sum, I would describe the game as more of an action and movement oriented puzzle platformer (as opposed to more "sit and think" type platformers). I found the experience of playing it to be vaguely similar to the Trials games (except for the aesthetic). If you like puzzle platformers, definitely get this game.