don't blame the animal's type 2 diabetes for your failure (though it IS annoying they can't walk up 30 degree angles), blame your bridge. the physics of the game (or mabye something else, i don't know) make it so simple stuff works. many levels i spent an hour plotting elaborate designs when a simple chain of decks would suffice. if something isn't working, cut off unnecessary parts. For example, I used a simple swing (a deck with two ropes connected to a point) and I won. oh, and you can make a loop made of decks in a cliff and it will stay hooked into the cliff.
this is a really easy 65 points. I beat it in a few hours. btw, never go into a fight for treasure if you don't know if you'll have enough health to keep going.
Another tip: dirt and gems respawn after leaving the screen: go back and forth at high depth and shoot mole to collect and you will get Connoiseur and Diamond lover awards worth tons
TO GET THE HARD BADGE: Get balanced Drill, Hull, and fuel at start. Try getting lots of coins to start. once you get to one thousand+ depth get nitro and mole. after you get to the end, keep pressing play to replay the last level. Get trophies until you've got them all, then aim for 150000$ in raw cash. that should get you the biggest boat.
You realize that on Macs you can use ctrl-click (hold down the control key while clicking) or cmd-click (I don't remember which, try both) to do the equivalent of a Windows right click? Aside from that, I agree, great game.