Hello and thanks for the feedback!
As for the bugs you have mentioned I have already fixed them in the new update I have been working on (I will be posting a devlog on the update later today).
As for your suggestions, I really like the ideas you gave. I imagine having something like minecraft’s bedrock under the worlds would work. As for key binds that is something I will try to implement in this upcoming update as I could imagine this would be a good feature.
I appreciate your feedback and hope you enjoy playing the game!