Overall a good start to a fun game!
Suggestions: make the boat's bow pointed more up so water doesn't go over it and make easier controls for the crane.
So what I did was:
1: shove one of them into the goal
2: realize I got it stuck
3: Made a spark nuclear bomb
4: bring the simulation down to like 1 FPS
5: crash Algodoo
Um, try actually connecting the pieces together and it will be a decent crashable.
There are a good amount of tutorials on Youtube that should be easy to follow.
Well using the motor slider values can be a decent bet, but the best way to do it is by scripting the motor.
Try putting this script into the motor's postStep: