Yea when making the money system I did notice that pressing jump while already in the air would still take away money. Though I couldn't really think of a solution so I just decided to give the player a bit more money, since they also lose money if they just keep pressing movement keys!
That is an interesting idea, it might be tough for me to make but I'll think about it. I made the game with simple platformer in mind. If I do make a puzzle game in the future I'll keep this in mind!
Thanks for your feedback!