I would totally go for an engine here. There are tons of great 2s and 3s to buy with goons, great source of +actions, the trasher is slow, but with alchemist drawing most of your deck(and fishing village being a duration - fewer cards to draw), pick up an early trade route and go to town. You've got goons and oracle to slow down the IGG rush, and the rusher will power up your trade routes.
It's certainly more fun than playing IGG.
edit: After thinking about it, I would open FV/Potion, pick up another potion with my next 4, and get a trade route. After that, I'd get some fishing villages, another trade route, and pick up a goons relatively soon, and an oracle if you aren't winning the trashing war. Once you can draw your whole deck every turn, you buy FV/goons/hamlet/oracle(for points). Not sure if it's fast enough, but i bet it is.
edit2: looks like it's pretty close on a 4/3 vs 5/2 board. Alchemist is actually really slow with the curses. Not sure if you have a better strategy opening 4/3 against a 5/2 going IGG rush though.