SCRATCH IS SO AWSOME YES I USE IT TO MAKE GAMES HERE MY ACCOUNT
https://scratch.mit.edu/users/BlueCupMakers/
ok srry yes you can use it to make a game. just use this scratch to html and if you every want to make the game downloadable (after the jam) then i suggest make it a zip. here: https://sheeptester.github.io/htmlifier/
EDIT: you ask too many questions but it ok ask as many as you want