Later challenges get to be kind of insane, since you apparently get no bonuse benefits. Just from the standpoint of initial cash, most of the valley road challenges are practically unbeatable
There needs to be a readout for current currency somewhere, not just a per/second. If I don't know how much I have right now, things are difficult to plan...
Problems: You have NO control of your ships, no control of targeting, no movement options, and very little by way of upgrade options in any meaningful way, plus no descriptions. Lot needs to happen to make this worthwhile.
As a side note, there are a bunch of fun bits and pieces in this game, for those wise souls who take the time to explore, click on things, and talk to people more than they strictly have to. Gravestones and priests are especially useful to talk to (*cough* hint hint *cough*)
You need a LOT more researches. by the time you're near level 30 university, you're gettins WAAAAY more than you need to get the highest research possible so far, and that isn't even close to the number of universities you need for the achievements, etc
that mystery upgrade was totally not worth it. 2 chests of every type does NOT compare to the 100 red research points needed to buy it. Not unless you make red research points a lot easier to come by
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 "YORG.io")
 "NGU IDLE")
 "Idle Pizza Factory")
 "HyperDiver")
 "Idle Medieval")
 "Infinity Pirates")
 "What Is Orcs!? 2")
 "Doofus the Noob: Episode 1"){kind=icon}
 "Idle Intelligence")
 "Box RPG")
 "Idle Defense")
 "Decline of Humanity")
 "Clickery Life_Click Die Repeat_alpha v.0.8.01")
 "Realm of Idlers")
 "Idle Empire 3")
Should be fixed now!