Dragonruby Sokoban

This is the first game I built using the DragonRuby GTK. Over 20 years ago I have already created a similar game using Turbo Pascal so I wanted to see, if I could do it again using Ruby and the DragonRuby Game Toolkit. The levels are defined in a simple txt file and can edited. If you want to, you can add more levels. In a future version I want to add a simple level editor. I hope you enjoy this simple game.