Thanks for the feedback! I've already gotten started on the bugs you pointed out - very helpful! A tutorial sounds like a must at this point as well.
The second level is by far the most difficult, and is meant to play like a Flappy Birds homage. It does get a little bit more interesting after you make it through the pillars. It is very difficult and requires precise timing of the jetpack. It does feel good once you master it, though!
I've played it a lot, and make it look easy ;)