Zach Barth (maker of TIS-100) did a integrated circuit design game in Flash back in 2009 which might interest you:
http://www.zachtronics.com/kohctpyktop-engineer-of-the-peopl...
It's somewhat more of a game than DLS is at the moment, though working at a much lower level.
Re:DLS, the digital logic simulator game
by qwertyuiop924 on Sunday August 07, 2016 @11:17AM
(#12242280)
I heard that Kohctpyktop was Zach's most brutal game. And between The Guild of Alchemical Engineering, SpaceChem, and TIS-100, that's saying something. The phase: "I can't beat the last level of SpaceChem," has become almost memetic in nature. IIRC, Zach himself couldn't beat it.
By the way, from the look of it, if you like this game at all, you will love TIS-100, and should totally go buy it.