I enjoyed the game and the concept. I thought it was pretty fun to play and intuitive. I would say the main feedback I have would be to work on the UI. Sometimes the blocks blended into the background, and it was difficult to see if there was a platform or not. I like that the portal is a different color, but when I first saw it, it looked the same as the windows in the background. I think that can be fixed by making it glow or be bigger than it already is. Another solution could be to have everything in the game be pixelated art while keeping the background flat, and this would make it more clear what the user can interact with. I also didn't know how many balloons I had until I full screened the game, but I think that is a simple fix of size. There was also a bug where I couldn't double jump in the first level, but I could for the other levels - not sure if it was a bug, but I found it a bit strange.