So, I put some text over to show the controls but I think I didnt do it right while building the game, ill put the controls in the description of the game, thanks for pointing it out.
As for your second point of making clear where one should change worlds. I had that in mind and will be implementing something of that sort later on, as this was put together really quickly in less than 5 days. And I will also work on making the spawn safer.
Thanks a lot for checking out the game and leaving feedback, I appreciate it.