First of all thanks for playing the demo and giving feedback!
1. corebreak + autoplay - this is an interesting idea, i have not thought about it honestly. i will definitely experiment with this and try to see how it feels.
2. reaching corebreak next run is definitely something i've been wanting to fix. currently trying to playtest the ideas where the mine becomes tougher to break for each time you have reached the core in the planet. will see how it goes
3. anti-pooling - you are correct and some other playtesters have highlighted it as well. most likely it will get cut out or reworked
4. regarding demo cutoff, i do understand that, and maybe i need some more connection to put with the 10 corebreaks needed to "finish" the demo, e.g. when you first get first corebreak, maybe i need to somehow highlight in skill tree that "this is" the goal. I did want to keep other planets as a tease as well, after all this is a vertical slice of a full in-development game
5. regarding side content i understand the need for it, i just wanted to higlhight core loop with this demo. currently i have ideas, such as trading/clouds/cosmic tree/ore events/etc. but all of them are in development and will most likely be part of a bigger demo that will be released in next few months or be part of full game.
Once again, thanks for the feedback! Hope to see you back in the future ^^