i always die in world 3 or 4 some tips?

Hi, the game is fun, but I do not know how to safe my progress. every game I have to start from the first world. I know, noob question, but I cannot find help anywhere :/

on the market, pls give a save option to continue later. On a long run, sometimes I want to left the game and continue later. If there is, I could not find it.

Is there anyone who has played the game on Steam Deck or some other portable that can tell me how common hard-to-read text is in the game? I don't notice anything in the trailer on the store page, so I'm wondering if it's something minor like just the main menu, or if it's a more prevalent issue....