Cool mechanics! On my first attempt, I was too scared to use up my health on the jetpack, so I got too far in and the speeding up of the obstacles did me in. On my second attempt, my strategy was to greed for every block and use my jetpack as much as needed. This worked great, but I think this strategy actually made the game a little too easy. Perhaps you could punish "fluttering" the jetpack more? I had fun playing, nice work!