Target Practice

First, welcome to the forum. I gave your level a go and I attempted 3 times and didn't come close so gave up. You spent a lot of time making the level and it looked nice but it's too bad the game play was so limited.

Did it on my 3rd attempt. I know the gameplay is too limited and it deserves 3* in my opinion (because you are a begginer). But that design is just too good for a begginer's level. I think you have respect for looks, just like me.
That's the reason I increased a star.
I see you took a screenshot of the level to make it look good because the level's orientation in the card is not good. For your information, there is a website made by @Gepeto where you can deal with such problems. You can customize your levels and can change the orientation too!
I did that with your level to show you:

Spoiler: Your level

As you can see the level now looks better in the card.

Sorry, but I have to go 2 stars for gameplay, +1 for the architecture. If you built the castle on a base of grass blocks and put in a lift so B could try again without restarting every time he missed, would take it to 4 stars.

@Don G Rowe - Seriously? 4 stars if B can recover? Restarting is faster than walking back to try again.

@gmacpro Yeah, I think so. The way the lever is set up makes it more challenging to find the range than usual. And I like action levels, so there's that as well ...