Nifty idea and I really like the concept. The execution was a bit more lacking for me personally. I would've rather something like this have lives, and be a little faster. There also wasnt much stopping me from just joyriding the bottom, the AI never followed me down there and I only had to go up when a obstacle was coming.
I'd rather see a version without the big flappy-bird style obstacles, where the focus is on trying to stay up while shooting enemies, that's where I had a lot of fun. Trying to dodge enemy shots while bouncing at the right time to shoot my own.