if you are stuck at about 10/20 secrets you probably miss the fork and the 3-set combo, you can find both when you are outside climbing the red walls at the top of the two canal entrances. you can actually go RIGHT from there ...
don't enjoy it very much. If you quickly ambush the nearest hive and don't waste any men on capturing towers, and keep all bees on the run to attack -> you never lose. Not really challenging at all. It just lacks depth.
@ Stoic001:
that is because you need 6, not 5. put your first ball onto the left side of the roller ball at the bottom, that gets it all going. you have a second ball, place that in bottom left corner of the "basket", it will take up space but it still pushes enough grunt in the end and the king swings himself out of its sleep.
good concept, had a mindless play till day 13 earning 20,000. then tried to get higher by just taking the right platforms (with biggest fuel tank and 3x fuel sucker). could have got unlimited high but gets a bit boring. earned 56m in that run.
too easy. buy fibur bow, beef up fully, then keep just in reach (116) and the frequent fire arrows will kill anything. later levels: one blocker and 3 archers. never lost a single knight !