CD32: Gulp!

The Earth is flooded, and a planet of goldfish come to save the day! This is a Lemmings ripoff of course. Nice graphics and music (That's a chip tune by the way, NOT redbook audio), and gameplay is quite good, though some practice levels where you get to know what each abilities does would have been nice (I don't have the manual, so I'm muddling through it here). This game can be played with a mouse or a regular joystick... either way, it has to be in the second controller port though (and I think it detects what you're using on start-up, so you'll likely have to reset if you change controllers. As you can see, I can't figure out how to beat the first level. I've cleared a path to the exit, but all my fish are stuck at the bottom with no way to get over that block. Anyone know what I'm missing?