No difficulty curve what so ever, it's just plain HARD, even the first level after tutorial is pretty hard. You have little room for mistakes and only ONE possible way to win a level, if you try to be creative you'll fail. If you forget a shortcut and try a few wrong clicks, you fail. If you take more than 1 second to do the ONLY ONE RIGHT MOVE, you fail. Upgrades? Nope. Progression? Yes, it gets more difficult on each level. Tips? Yes, but useless.

I really wanted to like this game but calling it an RTS is a stretch, simplified mechanics? yeah, do specific actions at specific times or... you fail. Challenging at times? Yeah, all the times.

I wish I could grind some currency to upgrade something to make it easier, have some room for exploration on different strategies, room for mistakes, room for... fun? As it is it's only frustration with litte to no fun.