You've certainly nailed the spin of the jam, the game is simple simple to learn and fun to play.
Overall I found hurling rocks at the boss useless. Even if I hit, it rarely amounts to anything, in the end the best strat I found is to just ram the boss with whichever spin moves them to the closest edge of their gauge and between hits ccollect the rocks which fill/deplete you gauge in opposition.
But other than that its a fun and interesting game