As others have said the streak bonus is too low, especially with all the new mechanics centered around buying tons of stardust. The fact that vortexes make each iteration more expensive to progress is silly as often players will be doing vortexes to complete challenges and not just to up overall power. You end up in a standstill doing nothing within a few days feeling like you accomplished nothing. More depth is needed not this continual slowing of progression by the dev through patches to hode the lack of depth.
Currently the gem counter is not tied to saves - I reloaded a save after testing some upgrades and lost all gems spent. Please make gems tied to save state or have them bound to our Kongregate account so that we can reset the game and still have gems we have bought. Cool game otherwise!
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We have done an update since this post, give it a try, they'll be easier now :)