1. Good game
2. But, I stopped playing(somewhere around flesh parts) because imo UI needs a bit of rework(based on initial release, haven't yet played after patches) - some ideas:
a) Toolbox with purchased items, so that bought but currently unused machines doesn't need to be on main area. Or maybe merged with buy screen
b) splitters/mergers - using only 2+1 connectors is simple, but it adds a lot clutter on screen and I don't think connecting those is fun part. Maybe it could be done as n+1 connectors where you chose value n by UI. when using toolbox such merger splitter could use splitter/merger points(so eg 2+1 connector cost 1 point while 3+1 costs 2 etc so that cost stays same as using n-1 2+1 entities)
c) when using toolbox you could add ability to save machine state(and load it later) which would serve as a blueprint mechanisms. Also this could be used to clear screen and start new design(load machine state)