Any engine is fine, as long as the build runs on Windows, Mac or the browser so our team can play and review your game properly :) 

The exception is games made inside other games (Roblox and the like) which are not allowed.

Hi, im creating a game and im using the track used as the thatgamejam theme. I used the file without modifying anything, but in the codei made the music reproducing in 0.8x speed and it enters a loop when it reaches an part of the track. I am breaking the rules? I repeat, the file is untouched, the modifies in the reproduction are only in the code of the game. Thank you and sorry for the disturb.