Okay, that explains it then! Yes, after the two levels, you get the first one, but with enemies. The music is very different from the atmosphere of the menu screen, but it sounds nice. Sounds a bit like an easygoing track from an old Mario game (or similar old platformer), but with modern quality.
hey. If you beat the rising water level, press the Play Again button. Go to the top of the level but don’t go thru the door. There should be a hole in the roof. With it comes a whole new set of levels
The level after the vine-climbing level has so far taken too long for me, I can't use more of my time for it right now, unfortunately. On that level, climbing upwards is difficult, but you also get places where you can get stuck and you have to restart the level.