Nice - cute puzzle game all and all. Only part I kinda got stuck on was I didn't realize I could go left on the second last level and got a little confused rip, but once i figured that out I got it right away! And yeah the big Luigi is terrifying haha.
And I know it took me a second to figure out all the controls, so as little guide for anyone else playing;
Enter - Next button, and start menu (very helpful for the reset feature)
Arrow Keys - Move
X - Drop / view current power
Z - Sword attack / Gun
Click - Guide the Luigis / have them follow with the whistle power up (you do need to walk into them just to wake them up first tho!)