I thoroughly enjoyed my time with Wattle. It's cohesive art style and animations work for the type of game it's trying to be. The inclusion of a tutorial was particularly helpful for getting the hang of this type of games mechanics. In fact I should probably get around to adding a tutorial just like this one to one of my games...
However, I did end up killing a couple runs prematurely by hitting ESC to try to drop items. Very frustrating. Also It took me a moment to figure out why I couldn't select buildings at the start. It may help tutorialize if you start the player with some power.
Despite these minor setbacks, I'm impressed with the amount of content and balance that was able to be packed in given the timeframe. A+