1. Yeah, I will add in more obstacles later on for more difficulties. I will add in varieties of enemies and also traps to make things more exciting. I just want to make it easy for the demo to see how others feel for the game first and then add in some difficulties.
2. For the game physics, I kinda wanted to make it where the character is like a ninja with high jumps and all that, but I will look into that and play around with the physics to see which works for it.
Thank you for your suggestions. I will log these into my suggestions lists to further improve on the projects. If you have anymore, feel free to give more. :)