It is absolutely insane that you aren't charging anything for this (please consider adding PWYW so I can give you money?). I am a rusty GM with a table of mostly new players, and already have managed to start several interesting storylines and have a lot of fun on scores.
The places these rules depart from the SRD can be a bit subtle (I especially messed up when assigning Heat the first time), but going with the flow and using ocean magic liberally seem like a golden ticket.