Honestly not very good because there is no difficulty ramp at all. It’s either “absolutely impossible” (default mode, 2 lives) or “trivially easy” (enter a code at the beginning screen, get 20 lives per run)
Boring enemies, no variety. Soundtrack, premise & graphics are OK though. Punching out the scuba guys is one of the more fun things you can do on this game. Pretty low-imagination other than that.