Help in GameMaker

Are we allowed to fix bugs after the GX Jam submission period ends? I also forgot to compress the textures and would like to do so if it's allowed.
I have already made a post about a engine bug that might stop me from winning the jam, cant be bothered to type it out again. https://gamejolt.com/p/i-am-aware-of-sprite-glitch-where-the-pla…

I am aware of sprite glitch where the players are replaced by the bg, the asteroids replaced by players, the red line that is an unsued sprite, and the restart replaced by the asteroid spawner icon...
seems like an engine problem... way to go YoYo
Hi, everybody! I just submitted my GX project. Does anyone know how to upload it so people can play in the browser? Also, is that mandatory for the Jam? I've only got a downloadable zip...