HELLO ILLIAS! THANKS FOR THE FEEDBACK!
1. Yeah! I intend to develop it as a full game in future
2. To be decided
3. I used the in-engine ones
4. I choose GDEVELOP for created this game and for graphics/game assets i used piskel which is integrated gdevelop game assets creator just like aseprite
5. Currently, i'm having 2 years experience in gdevelop and had learnt a lot by mistakes, therefore there were not any big challenge in front of me
6. previously before this game jam had start, I had watched a video I had forgot the name of the channel and the video but after watching that video that video i wanted to make a game, and it turned out into this game.