This may not help at all But Im Trying To recall a movie in the 1980's there was a little kid and an alien and the only thing I can remember there was a lot of green glass and there was the price is right playing in the background

It is Not ET, Flight of the navigator or Mac and me.

Et?

Maybe, Explorers ,about two boy building a space ship.staring young river phoenix and ethan hawke

The Last Starfighter?