dimln, for the level 30 boss wave with giant axes, I think this is what I did, but hopefully you get the gist either way. Start in the middle row for the first axe, then move to the top row right after an axe falls there, then when an axe falls in the middle row, move to that row, and then right after that go up to the top row again. Basically, just use the top two rows and move to stand on top of the latest axe, because he won't throw at the same spot twice in a row.
Chris117788, you don't even need to hear it. For some reason, the volume is messed up for me and I have to turn the volume all the way up to even slightly hear the musicians playing, but then the other sounds are way too loud... so I stopped turning the music up. The puzzles work without the music.
If you get stuck, just hold R to restart and you should respawn without losing any task progress. (I got stuck after placing the luggage together, restarted, then I appeared in the control room and the game had progressed.)
Having the problem maverickmila mentioned, as well. A lot of letters won't work in the text field for submitting a high score, and the backspace key can sometimes take several presses to do undo things.
lshane, the trenches on level 10 can be killed! I thought they couldn't, but I kept firing at them. They just take a long long time, because your shots seem to "miss" more often then not. Just keep attacking them.
Darkmudkip, set waypoints to guide your people around the right-side-enemy's island to reach the totem on the other side. Try not to make a bridge connecting to the enemy's land.
You'll have to set a way point to get them walking in that direction, level the earth to build a path through the water, and then occasionally have them build a village or two as they go along.
Also, when you get the tidal wave totem... every level becomes pretty easy. Just build a big hill, save your mana as you do a teeny bit of building down below to keep your pop growing, get all your people onto the hill... woosh. Wipe away almost everyone else and then finish off the stragglers with other totems.