I don't see why people are having problems with their lures being eaten. If a bigger fish is headed towards your lure, just reel it in before the fish gets there. There's no point complaining about a game just because you're bad at it :/
Not bad, but the characters talking every time I issue a command gets very annoying very quickly. Might do to have them only say it every couple of commands?
The fact that they can't push boxes up a very mild slope, and the seemingly arbitrary length limits makes this far, far too reliant on trial-and-error. Often I've had to redo the same basic structure several times with minor changes in angle and length to get things to work, and that's very tedious.
Don't particularly like the idea of penalising for pausing really. Seems pretty meanspirited.
I might just be being bitter because I really suck at this, though :P