Very cool concept and great execution! Love the fact that you can suck up enemy projectiles. Also great SFX, the health sound is great.
Like others have said, I believe an improvement would be to respawn the trash every now and then, or perhaps when you get near a vending machine it uses all your collected coins to generate trash. After 2-3 minutes in game I found that I had run out of trash on the level and was relying on enemies shooting at me in order to get ammo.
Nice job!