The one problem with this game is that the infinite mode doesn't get any harder, so once you can win, you can almost always win. After a while, it just starts getting too repetitive. But other than that, it's a great game.
The solution to the elevators is entirely stupid, but it works: Build a three-level elevator, then an ordinary room above it, then another three-level elevator above that. Then build a three-level elevator in an adjacent column so that it links the two. Your guests will zig-zag their way up and down, but because the elevators come almost instantly, they don't complain about waiting. Upvote this and lets get it onto the top five.
The solution to the elevators is entirely stupid, but it works: Build a three-level elevator, then an ordinary room above it, then another three-level elevator above that. Then build a three-level elevator in an adjacent column so that it links the two. Your guests will zig-zag their way up and down, but because the elevators come almost instantly, they don't complain about waiting.
All it needs is an ability to sell ships whenever you want, rather than when you run out of cash. Then you can sell off a few ships to buy the final shipment.
To get the bomb upgrade in the crystal cave, you need to be able to reflect bullets. The little fireballs the snails shoot can destroy purple crystals. Stand under the first one and reflect a shot up to it from the snail, then you only have one to walk through.
Fastest way to get to Humans:
Earth + Fire -> Lava
Water + Lava -> Stone
Water + Stone -> Sand
Water + Earth -> Swamp
Sand + Swamp -> Clay
Air + Fire -> Energy
Energy + Swamp -> Life
Life + Clay -> Golem
Life + Golem -> Human
Once you have humans, you can combine them with a lot of things.
@Adamatic: The problem is that you either look at it as a demo for a $15 game, or you look at it as an incomplete game on it's own. Either way, it's not that good. I'd probably rate it 3 stars if it was a complete game, since I'll admit the concept is certainly interesting, but some of the rooms depend on timing that's far too tricky to keep me interested.
A guide to actually acchiving the badge: http://www.youtube.com/watch?v=SbCl9ox2wnw - The short form is: Buy all boosts, use them right after launch. Then use all the skis you can afford, then use all the freakys.