CANDY THE CAT GETS A GUN

Its a side scrolling, plat-forming shooter. I watched the Shaun Spalding plat-former tutorial and this is my own spin on it. Theres five levels but I may add more. I want to add more vertical platforms, other guns, etc. but I have no idea how to right now as Im still learning GML. Any tips on GML would be appreciated. Otherwise enjoy and thanks for playing! Game is in a ZIP file.