Got to wave 24. Such an addictive game that does many things right, I wasn't impressed at start but then ended up very much hooked. The variety of upgrades is amazing. If looking hard for things to complain about, I wish there were more ways to help the Earth recover, in later waves if randomly I don't get Earth recovery award for few waves in a row it is pretty much a lost game. Great work, you should be really happy with what you made here!