I would really like to write something positive about this game... Yup, it's quite terrible.
It's most certainly a terrible game. However, so I can learn from my failures, any tip for my next (and second) attempt of a Game Jam?
If you are still learning it's best to enter jam in a team with some more experienced people. You will learn a lot from them (I'm sure much more than learning by yourself) and game will be better.