Myth vs. Mythos by ryusui
You are Aglastia, Goddess of Life, come to bestow your blessings upon a barren, newly born world...
Alas! Z'golmok, an eldritch deity hailing from an unspeakable corner of the cosmos, has his own designs on the planet! Even now he infests it with his corruption, and if nothing is done, this world will be completely unfit for habitation!
This will not stand!
Breathe life into the world and fend off the eldritch threat. Plant trees to spread your reach, and build houses to call your loyal followers to action, harvesting Divine Influence and defending your trees from Z'golmok's minions. Build your power up to the maximum and scourge your writhing foe from the earth with your divine radiance!
Mouse and keyboard controls supported. WASD/arrow keys/scroll wheel to scroll; click or corresponding key (1-2-3) to select action; click to place/fire.
Created in Godot 3.5. Graphics created in Aseprite. In-game font is Cormorant Garamond Bold Italic (courtesy of Google Fonts).

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Also, MythOs from Boneworks?
@sean-spiggle long story short you want to kill all the purple wriggly things, and there's two ways to go about it: you can grow your territory right up to the edge of theirs and build houses, which will spawn soldiers that will kill monsters and tentacles, and you can also charge up enough mana to simply nuke things with your Radiance. check the bottom-right corner of the screen: there's both a gauge and a textual indicator how much mana you have/need for your different options.