one suggestion - a speed up key -- when you're going the engineer root you can (on some levels) get into a position that you have to wait a lot even with the "next wave" key ... so an option to speed up things would help a lot ...
other than that - a great game
on the "plane", "plain" issue - both can denote a surface - "plane" is a mathematical term, "plain" is a geographical term -- so both are valid depending on the context
in this case "plane" is definitely better suited - but a spell checker doesn't do context
stopped at over 4 million and 15 cities ... too short and too easy
just a few changes i think would help:
1. a sell shortcut (+ click) for the weapons and armor so you don't have to drag each one
2. when you press "ignore" on an event - immediately continue the voyage - no need to press go again
3. when you are the enforcer - have events in which you inspect the travelers cargo, and the same for the buccaneer
4. make the prices change over time and based on the availability of the resources - this doesn't make sense as it is - a town will still offer, for instance, 12500 gold for diamonds after you haul 300 units in in the span of 3-4 days ...
finished it without a hitch and I didn't even notice the main unit size upgrade :) -- wanted to upgrade it on the next level when i saw it and then it was over :D
@stupidguy - are you serious? good numbers - this is a game of endurance more than anything cause u can probably go almost indefinitely when you are fully upgraded -- but as it's a waste of time at that point who cares...
well that was easy - just always keep enough money for the next elevator (every other lvl) - i didn't even shoot once for the last 6 lvls (not like i needed to before) -- made the 7th elevator all laser (all were lvl 3 on the 15 lvl) and just moved it where it got crowded -- the rest were all random but powerful enough not to get quickly overwhelmed - didn't use even one of those pusher turrets and only one rocket turret... - mostly gatling and laser...
and now for the reverse madagascar problem :D - started at madagascar and can't get anyone else infected cause mafagascar is a ship black hole - over a dozen ships docked in this one (haven't seen that many ever before) but not a single one left madagascar... :)
the only game flaw is that it can't allways be beaten (and i don't mean the difficulty) - u rely on a ship to coming to madagascar at just the right time - and that's completely random and has nothing to do with strategy...