You're complaining that you have to wait half an hour to get enough coins to level up a nymph in an idle game? I repeat, you're complaining that you have to wait in an idle game? If you see that as a problem, then idle games aren't for you.

On performance, the game is quite a memory hog, but it uses very little CPU power. If you're trying to play it on a computer with only 4 GB of memory, then yeah, that's not going to work very well for you. Or even substantially more than that if you were hoping to do something else on the computer at the same time as letting an idle game run. It also doesn't help that it's an idle game with memory leaks, which is not a good combination. But really, it's a throwback to an era when you needed a ton of memory to do anything.

I'm not sure why you think you need $20 just to try the game. The pricing scheme does pretty much say that if you're not a whale, they don't want your money. They're trying to charge $20 for an amount of gold that you could get quite literally by logging off and coming back 24 hours later. But right now, as I'm about to reset, I'm above level 300 and have 32 nymphs unlocked with 13 of them at max level. And yes, the game just launched yesterday and I haven't spent a dime on it. I don't find that consistent with having to spend $20 to try the game.