I'm pretty bad at Besiege, but knowing there were new levels motivated me to finish Ipsilon, so I finally did!
Took me forever on the last one though, killing all the soldiers, breaking the houses/mill and causing enough damage to the castle.
I got lazy in the end and used my incredibly awful helicopter/plane bomber, and just got lucky with the bombs dropping in good enough places.
I can't fly the thing for stuff. It goes forward, and I can get it to turn slightly, but that causes it to go out of control, and it's guaranteed to flip over forwards, despite me trying my best to balance it out. :/
Anyway, onto the new island, but I was tired so I stopped before even completing the first level. I shall get back to it soon though.
(Also, I haven't played for a few updates now, does the Drill item do anything special, or is it just a new spikey-type weapon?)