Managed to finish the game :D it's a good first start for a platformer, try using the same artstyle for the assets if you can find since you are mixing 4 different sources it really doesn't look nice. Also if you want to keep making platformers implement a jump timer so that even if the user presses jump before hitting the ground he still jumps, you can find a script on this on Youtube first two tips: https://www.youtube.com/watch?v=vFsJIrm2btU