The art is lovely, definitely the strong point of the entry. I have no idea if the angle of the tail is changing while holding Space, since tapping it make the tail go into random directions most of the time, while holding it for some time will make it go straight up. Since there is no in-air movement, it is very hard to reach certain platforms. I was able to get almost to where the first character was after trial and error of holding space for different amounts of time while on the second platform.
The idea is there, but execution needs some work. Keep it up!