Thanks @tar for try it.
1 failed shot and 3 shots over 400ms !!!, at least this time the game still gives you chances to improve the score

. I think now the difficulty is more balanced.
The evasion algorithm uses these parameters:
- Detection distance: 300px
- Duration of movement: 500ms (the speed varies but the time is constant)
- Minimum time between evasions: 800ms
That is, the target does not react when it is in motion, and when it ends it will be stopped at least 300ms.
So for slower players it may be better to reserve the first shot and lose some time following the target or they will have many negative scores (as happened to me

until I found the right tactic for my characteristics).
Regards.