I found this game to be really enjoyable and easy to navigate with different upgrades being esily identifyable and understandable, well described. I would suggest possibly adding more upgrades such as an auto-clicker to allow the grind for money to be less tedious, also sound would also improve game play.
The prices and firework colours are they ment to coraspond to the colour of the firework coming out of the box and how much each one gives you?