The idea is pretty cool, but the progress is suuuuper slow, and to be honest it's too random. Buying more worlds requires you to go to another window, and scroll and press a button several times (while you can't see what you get on the main screen). A side bar with planets should be enough. You click the planet you add a planet, simple. Why bother making it a whole different menu.

Upgrades are too expensive, they're not balanced with the amount of money the planets provide, I had to play for like 10 minutes to buy my first upgrade. At that pace I'll only have 6 upgrades per hour (hopefully not, but just to show the scale of how slow the progress is)

It has UX issues, progress issues and balance issues, still I see the idea has a future, it's not bad at all, as someone else said, the problem is the implementation, you just need to polish those things.

Hope it helps!