there isn't much time left >.<
Weed, there are 19 days until you can submit your game! That is a lot of time to make a game!
You don't have to make something extraordinary, something simple is enough! You can use only simple shapes and make some simple scripts.
heck yeah man u got this. for sure! thats the whole point of these things! to go outside of your comfort zone and get better at the craft!
there are tutorials that may take 2 hours for character creation , and as started above you can always use protoceratops shapes or magicalvoxel . Just spend the a week or so on that and the last 13 days on programming and polishing your game .
https://unity3d.com/learn/tutorials/s/scripting