i couldnt kill the last little tree in the bottom right ... but i enjoyed the game. the drawing animation got a bit annoying once i was drawing loads of cards xD 
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Thanks I'm glad you enjoyed it! I am thinking of updating the game with possibly a more island-based system, so when you finished one the map would expand and get harder. And yeah, the cards weren't really that optimised for getting loads of them, as is probably quite obvious by the fact that they've gone off the screen.