Ohh ty so much for such full feedback! <3
1. We are thinking to do a port to mobile/tablets and by this we will also change that you can start to drag the jump for any point of the screen so you will not have this problem of running out of space on edges.
2. You are completely right. Due to time limitation, some game design and mechanics were impossible to introduce, but as we are going to keep the development of the game we hope to polish and add more features :D
3. Actually, we did not plan to allow the player make a double jump, that was something completely out of the box haha but I really liked your idea of making it part of the game and intrude a slow-motion when you are doing the double jump.
Having said that you are welcome to follow us if you want to be updated when we developed a new real game version :)