Wow, This is the first time ever someone post a video playing a "game" that I made. Thank you so much bro <3.. that means a lot.
And sorry for the confusion .. It seems that I'v done a pretty bad job in making sure the mechanism was clear.. here's a key tip: Red objects while aiming at it and holding LMB ,, will get smaller when the distance between you and it get closer, and the vice versa. BTW.. sometimes you need to move towards the red object and other times the object itself moves :)
I hope this was clear.... try again .. something cool await you in the next levels :P