There is no point in buying anything other than the first two upgrades. Their price never increases so they are always the best deal. And once you have damage per click at about 250 and per second at about 750, you can buy either endlessly without ever running out of money.
Also, there is nothing else to do except fight enemies which don't improve according to their own stats, their health is in direct relation to your damage per click. And you can never die or get damaged, it is just a non-stop button bash with no point to it.
There is potential here but it needs a bit of work on the numbers, algorithms and extra features. The description sounds great, now all you need to do is make the game which matches that description!
Also, a few spellings to correct:
Magic Colector (collector)
Whater book (water)
Esential Rune (essential)
