Really nice take on the theme, I found myself getting stuck alot by the corruptions I would cause though, might be a good idea to make it so the player could pick what tile they're going to put down. Good job!
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I thought about doing that, however I decided that making it pseudorandom was more in accordance with the theme. However when you "beat" it you are able to pick tiles and even draw the map to your liking. I wanted that to be sort of a reward (after beating the game, use right click and the scroll click to cycle through all tiles).