A very interesting game, I had fun playing it! I don't think you need a specific button to dodge, since the two attack buttons, spin and fire, already make the character invincible. Congratulations on your game!
I thought it was needed because it can get you far out of the way. The dodge makes you go fast. Also, it is needed for me to beat the grilled cheese phase 2 boss. With the cheeseball attack, you need the dodge to get out of the way of the cheeseball. other than that, thanks for the review!