Nice entry. You had a number of upgrades, and an ending. The robot was cute. I enjoyed it enough to finish it. Your music choices were fantastic! I really felt like I was in like an 80s Gundam-style game.
The enemies were a tad boring. Especially the green robot. And I spent a lot of time waiting for the purple ones to float to the top of ledges so I could shoot them. All my dying came from falling into spikes I couldn't see beforehand. Also, the gun was almost completely pointless. The sword was so much more powerful.
I found the wall kick especially frustrating when I got it. It took a lot of tries to get over that first ledge, and that was the hardest jump in the game. I also didn't see the point of the energy. It was really annoying to wait for it to recharge.
As others mentioned, the sound design could have used some work. The shooting snipe-only baddies were SO annoying because you could hear them all over the map and they were incessant, grating, and loud. The hover sound also seemed like it didn't have a beginning, loop and end so you could cut it off when the player cut it off.
You also had no deadzone for the controller. My character kept wanting to face left because of some drift in my controller. A deadzone would have solved that.
Despite the issues I had, I still had fun! Nice game!