Thx for the great feedback! :-)
The helping line (where the ball would go after hitting something) was often requested and is 100% valid. I am not doing it just because I would have to do the physics (not the worst part) AND my calculation would have to match the godot physics actually happening. Currently, as I am not yet doing _all_ of the physics on my own, this line would lie and therefore not help. In the (late) future I want to do really _all_ the physics myself, and then I can do a lot more stuff like this.
Then the "R" - sorry my fault - is not a Reset but a Replay of your last shot. It's just to look again at a marvelous shot or show it off to somebody. This is a very lame version of a whole Replay of the whole level, which would be what you really want. I still have to think how I could get this done well... The missunderstanding of the "R" is definitely my fault. I should explain it in the tutorial!
Thx for the useful feeback again!