if you are saying a generic side scroller, no, but say the game moves itself (the player) and you control the enviornment, yes it is allowed.
Viewing post in Can it be like a side scroller
your game doesnt meet the theme, the theme was "you control everything but yourself"
instead you made your own theme, how game jams work is you have to wait until submission opens, and then you are given a theme to follow, once it is done, you can submit your game for ratings.
also you didn't read the rules either, so I have to disqualify the project, but you can try again another time when the next jam comes