I appreciate the creativity involved in making a Lemmings clone and I like that you have improved in telling the player up-front how to play. There still are some things that make playing this game awkward, like not being able to see the goal right away and how fast the Hrldngs move. I can see in the screenshot how you intended level 5 to be beaten, but the option to use the umbrella is present on the screen but won't work, so it seems like it's bugged.
It's a challenging game and I do get the thrill of "hey, I solved it" when I beat a level, so good job there! Keep improving!