Thank you for playing! All info on how to play is on the description of the game and in one of the game images, but in case it isnt clear: The game is about summoning your troops of little mushroom guys, and comanding them to attack enemies and decompose various stuff arround the map. You then bring the nutrients back to base to get mana, and use it to make the big spell!
Hope this helps, and that you play again knowing what to do.