It's Pacman, Edgar M. Vigdal style. Just like with Deluxe Galaga, he took a classic and gave it a touch of creative magic, without twisting the basics.
Shareware was a type of software, where you could play a limited version of a game, then pay a nominal fee (mostly) to get access to the full version. Many a game followed that trend and many later famous franchises started as shareware releases. This game is the full version, released to the general gaming public by Edgar himself - and to that, I thank you, dear Sir.