Fun little game, you have made. 
I like the idea that you have a vertical screen instead of the normal one. It def helps to have a vertical space in your game. 
Art is simple and cool.
In general, it's a fun, unique game with good art. We tried to achieve the same in our game. We wanted to have a unique game but fun gameplay at the same time.

A nice little game with a great idea! I just wish the controls were a bit smoother.

Small game with clear focus. Visuals are clear, enemies have clear identity, background is nice to look at. The first level was very easy, I made mistakes only when the game started to be monotonous. I switched to the lvl 5 and it got hectic quickly :-).

My only real complain is the music. There's a reason it's off by default: it got grating fast.

fun concept, but i dont quite understand what those bottom-to-top bubbles do, tried a few times to interact with them but got no result. if all the movements could be a bit more physical (like with acceleration and random turbulance) it  could be perfect.

I liked the game, the graphics, theme and mechanics were very good. I will definitely return to the game later with more calm