I certainly do not mind. Another way is to make a new one with a target in the middle but different color (i.e. blue). That would be hard. But that's my opinion. You can do whatever you like. You have been doing a fantastic job so I am with you 100%.
I can make it slightly more difficult by adding a target in the middle, which seams to be possible after alot of testing. Do you mind I would change it, TM (what means your score will be erased)?
I think the level is great with its own strategy and a lot different - as SM correctly pointed out - than mine. Although the design is somehow the same it has a different concept of its own. Kudos to Jos. Having said that I can't really compare the difficulty between the levels.