Help in GameMaker

Ok gotta ask something about Tech Over, i have been trying to add both a modern and retro mode, retro mode is hard mode, modern is normal, i have slowly noticed this is a bit too ambitious, so should i remove one of the modes or keep going with it?
So, I'm dealing with a problem when building my game. The game runs fine when I run it in test mode, but whenever I set the target to a browser, the website does launch and open the game, but it gets stuck on the first frame and remains as a still image
Hi all. My GM is acting weird. I deleted a sprite & now everytime i open GM it says Warning & sprite is referenced (It's not) & says another newly created sprite doesnt exist (not set before reading) when i try to use it in game. Any ideas? Thx!
I have a question about the delivery terms of the game (for the Opera Jam). The game must be less than 5MB zipped, or uncompressed (with individual files)?
How can I make a score and high score system using time?