This needs some balancing. The fact you can buy a bishop on turn 1 and check their king to disrupt their economy is overpowered

Thanks for playing both. Did you by chance try to play vs computer on medium or hard level?

Is not it quite easy to defend against this attack simply putting a pawn before kind?

Yeah, just have it a go and it's way too easy to grab a bishop from the start and just use checks to get them in a bad spot