Hilarious little game! Maybe a little ear rape at the end with all upgrades.. but really great game! XD
What I would improve is that at the current state you don't really get rewarded for shooting those balloons down, you really just need to get that money of the plane. Then you can get better weapons and just shoot in the room. Its was fun! But it's just a thought.
The Concept overall is great and fits really well to the theme. Well done!
Also, pls feel free to check out my game as well :D