Thank you so much for playing my game!
First of all, yeah, the start button doesn't work because it's not a button. You have to press enter, maybe i could use a button or add "Press enter to start" in the text.
I really love the bouncy platform, for me it is my favorite part but maybe i could check some values to make them feel better.
Maybe doesn't fit the character because it's from another pack of assets, but i really like it.
The flag mechanic, yeah, doesn't make any sense if the player doesn't know how far is from the final, could add some indicator that helps the player to know about how many distance is far from the final.
Really appreciate your time and feedback!