Oop mb, didn't mean to double dip on suggestions! Went back and played again, a few other thoughts i had:
- very minor nitpick, but the text for winning, losing, and the next round are a tad hard to read being white over the white swirls
- i wish there were more variety of obstacles like the wave of icebergs that happen in the last round (good stuff since it forces the prioritization of getting the powerup or using the diving mechanic)
- i see (and feel lol) your implementation section, i bet water animation would do wonders in boosting visual appeal