Very neat game with a cool and unique set of powerups! The environments look nice, especially the forest area, and the level is just big enough to have a sense of exploration without overstaying its welcome. Sadly, I couldn't figure out how to get past the sideways gate and switch, so I ended the game with 88% completion rate.
My only few complaints: Lowering and raising the neck feels kinda slow. The choice for the walking sound effect is a bit odd, since it sounds like the robot is being pushed along the ground instead of rolling on tracks (which I presume it's doing), so I think something more like an engine hum sound could work better there. When I first got to the unfinished area, I managed to position the platform in such a way that I couldn't get back up there again, which made me restart the game thinking I was softlocked (since I didn't know yet that it was just the unfinished area).
That said, those are just minor nitpicks and overall I don't really have much in terms of criticism to say about the game! The physics of moving around and using all the different abilities work very well and I never felt like I was fighting against the controls, which I think is a big technical accomplishment for a game with such a high level of interaction between the player and the environment. Overall, great job!