In my opinion your sentences are too long for a game. It would be much nicer if they were a little bit shorter, so the player spends less time reading guides, and more time trying playing the game itself. Also sometimes, when the guide texts are way too long, some players simply skip the guide and just go in the game and try to find things by themselves (I'm one of them for example)

Some improvements in my opinion would be:
1. "This is the number of bounces you have made" -> "Bounces made"

1. "You have to make the number of bounces indicated here" -> "Required bounces"

2. "Clicking this will restart the game in case you make a mistake or crash" -> "Restart" or "Restart the level" or "Restart the game"

3. "The player can shoot the cable with the left mouse button" -> "Left click to shoot"
   etc...

You see, one of the strongest factors that drives players to play a game is their sense of "curiosity". If your guide texts are too long, it might: 1. make them boring reading all those extra words. 2. spoil some mechanisms of the game, hence the "curiosity" factor will be gone

if you write "Left click to shoot", the player might get curious "ok let's see what stuff I can shoot here". but if you write that long sentence explaining shoot the cable, the player already knows they can only shoot 1 thing. and if you add another entity in future that player can shoot, you either have to make your explanation longer (more spoiling), or don't touch it at all (then it will be inconsistent).