Two Portals - A Gemstone Puzzle Game

It's unclear what was the idea behind this puzzle game. Let's summarize, the title is misleading since there's no portals at all (unless you count the exit node to reach the next level). There are 60 levels in total, divided into 4 different "worlds", the only difference between worlds is that there's a different music to each, that's all. After playing the first 10 levels you basically seen all puzzle mechanics. You move from node to node, there's a key node which unlocks the exit, there's a locked node that is useless and might confuse you since the key node unlocks it but you can still move through it even when locked. There's a button node that will bridge new paths to other nodes. That's it. Repeat these nodes for every level. You cannot get stuck, there's no strategy in the order of the nodes you hit, it's just move your character to whatever interactible is available, and repeat until you reach the exit. It's a game that would suit a learning AI on how to solve very simple paths, not even puzzles. I beat the whole game in 22 minutes, there's no replayability, no move counter to try better optimum strategy, nothing. The only nice thing about the game is the music, relaxing and fitting.