The artwork is amazing - the druid, the hedgehog, the colors. I like that it is familiar game mechanics too; I feel comfortable from the start with what I need to do to get ahead and to win. I think this makes it more likely to be successful and gain lots of users.
Needs improvement - Needs a bit more explanation of why the trees/nature protect the environment vs. just putting up a wall or tower there, in order to keep with the theme of the jam. This will also help with a call to action - what exactly is “attacking” and why do we need more trees or nature to protect us from it? You don’t want it to be preachy but maybe a bit more clarity would be good. Overall, looks like a great game so far - simple, fun and visually appealing!