You did it! Congrats!
I made it to the hospital. I guess that's the good ending? :)
This was great for a first game. Some of the sound effects were really nice (the shot, the ting when you hit the barrier, the zombie sound). I felt skillful being able to time my shots and jumps for the balloons. Background moving gave a good sense of speed. Everything worked as expected.
One thing, at least in the story, is that the challenge is always the same throughout. Like the first 10 seconds is the same as the last 10 seconds (though I felt the tension go up since I was so close!). An improvement (if you want to keep working on this game) would be to have things start moving faster the farther you go.