I had fun with this game.
Although it has too many flaws to recommend it.

It is unpolished.
Forces you to hours of boring grind.
Game breaking bugs happen.

A lot of elements scream: I was a mabile game where you can pay to speed up things. We can't pay for speeding up things, but we can speed up time for free. Sure - laboratories/factories and research faccilities work faster... But also enemies act faster and you have to reapeat defend misions into infinity...

Finishing game on hard doesn't give you achievement for normal and easy - but luckilly you can load last save and repeat last mission with changed dificulty.

People who like turn based strategies might like this one... Although I would suggest to search for something less repetitive and grindy.