Possible Power Ups.

The first power up I would include would be a boost power up. This would make Flipper swim faster for a certain amount of time - boosting him ahead of the fishing boat trying to capture him. Like a sudden burst of energy.

After learning that Dolphins are very social animals, I have come up with one power up that I think could work really well.

I have decided to make Flipper a baby dolphin. From this the power up will be a defense one in which protects Flipper from all the obstacles for a certain amount of time. It would look a bit like this:

With flipper being a baby dolphin, adult dolphins will surround him giving him defense against all the objects.