I think that the game was alright. It was solid, and had some good things. I specifically really liked the idea of the bubble teleport things, and that was great. The game got very repetitive though, and I felt like I was just walking and going through the bubble things, and shooting an odd enemy. You should maybe have added some twists, and a more aesthetically pleasing design to the character and levels too. In addition, if possible try to make the enemies a bit more intelligent and aware of whats going on, not just making them go back and forth.
In short, this was a fairly solid game and it's good you're leaving room for improvement. I hope to see more of you in the future!