It's cool to see the original inspiration for what would later become the gel segments of Portal 2, had no idea they came from a different game prior to playing this. It's really short, only 25 minutes to fully beat, but pretty good for what it is. The puzzles never get crazy interesting, but they show that this concept had potential, it makes sense why Valve saw interest in this idea. The green jump and the red speed gels work the best, with the blue stick gel being a bit janky, but when has a gravity shift mechanic ever not been, especially for a prototype like this. The aesthetics also serve the game pretty well. They're very simple but they look pleasing for the quality and fit the style of painting colors all over it. Overall, pretty great proof of concept.