Even though you are allowed to submit multiple games it doesn't mean you should focus on trying to make as many games as possible. The main reason being quality over quantity.
Cause even if you submit 10 games it doesn't increase your chance of winning, it just means the 10 games you spent 3 days on each will most likely be a worse quality game compared to 1 game someone spent a month on. I recommend making 2 or 3 games max, that way you still have a decent amount of time to work on each of them.