People can use any engine they want.
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I edited my reply to remove the part about including the player controls info in the game because I felt it was slightly to harsh and also lots of other people just put the controls in the description.
Very simplistic but also entertaining, good job. If I could give a suggestion it would be for there to be some difference between the two characters to make it more obvious which player is which.
Well, "the use of sequential lines spaced one pixel apart to give the illusion of a lighter color" is allowed but using pixel noise is not; because pixel noise doesn't fit the theme even if it's only a few colors.
Due to popular request from people trying to make more detailed games I've decided that you can use gradients but you cannot have more than 3 objects/sprites/backgrounds with a gradient in total, the 2 main colors for the gradient count towards the 15 colors max. Transparency will also be allowed but you still need to keep your game minimalistic.
By colors I'm talking about specific colors as in #ffffff so if you have multiple different shades of blue they would each count as a color etc. You can't use a gradient, the whole point of the jam is to focus more on the mechanics by keeping art simplistic/minimalistic and it wouldn't be fair at all to other people already in the jam who haven't been told that using a gradient is allowed.
I've added ratings and they will be on these two criteria "What would you rate this submission?" and "How minimalistic was it?". It's a little vague because some people might submit just a soundtrack.
Thanks for the inquiry but I'm afraid I can't let you bend the rules. It is somewhat possible to do shading and outlining with only 3 colors plus it wouldn't be a challenge or minimalistic if you could use unlimited colors :P
By game engine I am referring to an Integrated development environment or framework for compiling and making games. examples: unity, gamemaker studio, love2d, CryEngine, etc. However, this isn't necessary if you are trying to make a team for sound design.
I don't know yet if I will participate in the jam but if I am, I wasn't planning on working with a team. Sorry about that.
Since you are completely new and want to get into making games I'd recommend you find a game engine and go on from there. If you feel like you cannot submit a full game no matter how simple or you can't find a team, It's fine if you submit a game soundtrack(no effects included).