It just started much later in dtop so I didn't bother thinking about it at that time and let's be honest, Dungeon Defense is technically one too and nobody was bitching about it. Also, Flowsand is best girl.
Threads like these, just recommend what you think it's best. You gonna get pretty much any popular novel, be it trash or a gem.
Population Control should be perfect for you. No BS, no Harem. His system is a little bit OP, but considering the task at hand, it's barely sufficient. Plus he's smart on his own, and you learn a ton of things about different subjects. Keep in mind that I'm the one translating it so I'm probably a bit biased.