I'm fine with it being derivative of Portal since its a great game to use as inspiration and this game executes its concept well and the characters are charming but towards the end it really drops in quality. The robot suddenly wants to trap you in his art gallery because the robot is evil in Portal so that HAS TO HAPPEN! When it would've been far better to just go through this robot's gallery and then he lets you go, he never seemed evil and in fact seemed to have remorse at various points so I don't understand. Also the last puzzle area felt a lot weaker in terms of puzzles.

Overall good game, short and sweet but I wish the end was more like the start. Loved the river puzzle for some reason.