it'll likely be that you can shoot them on the ground, or if they're falling
!!!!
Adding PCE console specific layer on top of that, makes for an interesting challenge (no, not a reference to Ys II).
Since we're now on the topic of Sea Monkeys, You can add a bonus virtual aquarium option to Atlantean where you can raise and care for some of the little guys. By reaching certain levels, scores, etc. you can unlock new scenery and different sea monkeys. Just a thought...
The only REAL problem with really interia-y controls is that underwater inertia would naturally be dampened. But maybe it is space water, so it is OK.