XenoBloom

Someways an interactive screensaver, for mathematically minded folks it may provide more. Not the most spectacular pixel art but works well for what it is. Worth nothing is the focus on plant-growth, not lifeforms. Fullscreen doesn't appear to be supported either which does reduce immersion. Only a few hints are given and gameplay is left up to experimentation. Draw in cells, fastforward time and watch the dancing pixels on-screen. DNA collected reveals new plants and mutations while power harvested gives the ability to change growth conditions.
Recommendation is based on being something quite unique.
Cannot personally compare it to Earthtongue, not had the chance to play it.
@Devs
Fullscreen support please. Maybe a time limited demo as well?
XenoBloom might surprise a few people if given the chance.

Xenobloom is an interesting, slow-paced ecology simulator.
It's less of a game and more of a "fish tank". You have some tools with which to affect an environment, and you use them to help various organisms grow and thrive. Some organisms have different unchangeable rules than others (ex: trees can grow up or down, but never underground or sideways, while worms and bacteria can only grow in soil), but all can be tweaked in one way or another. There are various soil/environmental conditions and nutrients that affect everything on the screen.
Xenobloom has various modes that provide different game rules.
Normal mode is almost a clicker-genre game— you harvest plants for "power" (basic points with which to influence growth and organism environmental preferences), modify the environment by adding or removing soil, and slowly unlock more organisms. The goal is to grow as much stuff as possible all over your screen. Environment-wide tweaks are just something to spend points on to keep them turned on— random events will raise and lower them, among other things (such as adding/removing soil).
Experimental mode is normal mode, but without resource (power) restrictions.
Observation mode plays the game for you. It would make a great screensaver.
Ecology mode is the most realistic, though it's far from accurate to reality. Environmental settings (water, wind, phosphorus, nitrogen, oxygen, carbon, sunlight, etc.) can't be directly affected, and organisms are changed to produce an excess of one thing while consuming a smaller amount of something else (ex: tall grass produces oxygen while consuming nitrogen). The player no longer has power restrictions for changing plant variables and terrain; the objective is to balance the various organisms so that every environmental variable reaches its maximum. If an environmental variable gets low, organisms that depend on it will struggle to survive.
Xenobloom isn't for everyone, but it's cheap and well-designed. I haven't encountered any bugs, and I love seeing systems like these at work. I'd love to see more sandbox games focused around restricted manipulation of an environment and its inhabitants.

I find this game super relaxing to play and the sound track is amazing. I highly recommend it if you want a game to chill out with and try to keep all the plants alive. There is also a background mode so you could have it running on another screen just doing its thing

XenoBloom.....well, it is a different game, I'll give it that. I downloaded, played and promptly lost track of time! It seems to be a relaxing type of game, but I wish there was a sort of tutorial to walk you through it. I'll definately be playing it more when I need to waste some time away. Personally, I like it. However, keep in mind that the game won't be for everyone. I'd recommend people to watch a couple of videos on it first before they make their mind up. Me? I'm happy with my purchase of it.

More of a toy than a game, but certainly an interesting toy. Nerds familiar with Conway's Game of Life will find it more immediately gratifying but ultimately just flipping switches randomly is just as valid a way to play. I don't see myself putting many hours into this but it's an interesting enough little concept that I found it worth the cheap price.

TLDR; cool game, would recommend, a little confusing with lack of explination.
its a very interesting game. you never intend to spend lots of time on it, but time flys. im actually left hoping the dev continues to update the game and adds some more to it. i do really appreciate the minimalist approach (atleast thats how i feel its taken) the only real critisism i have for the game is the lack of detail on contextual menues. example, there are different behaivors for your plants, friendly, hearty, and solitary, and im not too certain what each one means for each plant, or some form of explination as to what radiation or carbon or nitrogen do for you.

Great strategy and simulation game, that takes away the sense of godlike control sim players may be used to. In Xenobloom, you work with the environment but must also adapt to it's rules.
Pretty good art, especially visually interesting as you increase the density of plant life.
Game play won't have you on the edge of your seat, but responding to unexpected environmental changes and learning the basic rules of the ecosystem are great brain-teasers.
An excellent, meditative game for anyone interested in ecology, simulations, or puzzle games.