Short answer: I would definitely recommend downloading Viridi if you like idle games with a stress free ambiance, but keep in mind you can't really do much.
Viridi has really helped me be more mindful while working towards a long term objective, and not trying to finish everything as quickly as possible. It has made me slow down, appreciate the process, and be incredibly happy with every plant I grow. In an age where everything is ultra fast and excessively stimulating, Viridi is a breath of fresh air that reminds me to take in the moment and not live in a constant hunt of instant satisfaction.

Now, a more elaborate answer:
First and foremost, the game's art design has an incredible balance between bringing the nostalgia of low poly and at the same time looking very realistic, choosing to use succulents for this art style was absolutely the right call, I love how little visual noise there is and how simplistic everything is.
Which brings me to my second point, the game is VERY simple but it doesn't hinder the experience. Part of the charm of Viridi is how real it feels to take care of your pot of plants, you can water them, weed them, sing to them, and you get to experience their growth and flowering over time (not all plants can flower). This, however, means that you won't get an action packed game where you're striving to get anything, it's just you and your pot of plants which take days to grow and have to be tended to regularly (once a day is more than enough). You can also name your snail and sing to it.
The music of the game is arguably one of its best selling points, it's very chill, very relaxed, and can be turned off if you don't like it. I usually open up the game to unwind a little while I tend to my potted plants and then just enjoy the music for a while.
Being a FTP there are micro-transactions in the game, but they're very much optional and you don't miss put on anything if you don't pay (every week you're given a free random seedling and it's very exciting when you get one of the plants that you didn't have). The one downside I see to the game if you don't pay is you can only have ONE pot of plants, but again, I like how simple that is and how realistic that feels.
Viridi is definitely not for everyone and takes some getting used to, but it's a rare gem for sure.