Your game is a really good idea and execution, nice job!
Regarding monetization, you could change how the buttons look, and move the skip stage button to the top and change the color to blue, so it’s always there as an option, I would personally add trails, easy to add and easy to sell.
I would put them at the start of every level or world.
And later remind the players every few levels.
You may need to make to stuff more clear and exciting, 0,0065 ROBUX per visit is way to low.