Simple, interesting, original and hard as nails
I wouldn't call it fun though. I think it's because there's too much room for error so it doesn't feel fair. Possibly if the game worked on a grid or the rotations were in 15 degree increments I'd feel that a mistake was more my fault than an arbitrary imprecision. Same with the time bar on the bottom of the screen - if it went up in segments, timing the colour changes would feel more reliable.
Also, being able to modify the previous attempt rather than redo it from scratch each time would be a good service.
Also consider removing the abstraction and making it work on a real objective that would feel much more satisfying to the player. Eg. it's a linebacker who charges towards a goal - set the direction then his avoidances (duck, dodge, barge etc.)