The game was really well done. Of course, no game comes without problems.
My first and prominent problem has to be the fact that you are required to teleport back to the beginning when you upgrade. Players should choose to teleport back and the animation, while cool, probably needs to be faster as it gets old quick.
The second issue I have is that the game only has one sound effect, and I don't even know what the sound even is. Sure, it happens when the players falls but it doesn't exactly convey that. It'd be great to hear more awesome noises when you jumped, used the jetpack, maybe lasers when they are close enough, and upgrades.
Besides those, I feel like finding the batteries were a little more difficult to find than the final upgrade, and there is a bug where if you fall from a high enough point you will clip through the walls and somehow the outside of the walls become solid (though originally it was thought that it was some kind of cool easter egg ;) ).
Overall, well done on the game, the graphics are fantastic and with a little bit of work this game could see it's way into full fledged Robo-Adventure.