Dan Gorlin‘s Typhoon Thompson in Search For the Sea Child is a smart little title to play in an emulator now, although you do have to get the controls right to enjoy it properly. It’s a mouse and keyboard game but can be gotten to work with a joypad, if you’re persistent.
The idea is to skim the ocean surface in a kind of skidoo, and to knock out enemies and pick up the magical fish they drop to open up access to a magical item (and therefore the next level).
This is a cute game with nicely animated graphics and a satisfying feel to the controls. Well worth a play now, if you can locate it.