It is pretty easy to finish. Maybe if badges were awarded for getting trophies it would add a little replay value. And I agree about the quality control; my system gets bogged down on later levels.
2512 is my best so far. The trick to the double pits and the hanging thing is to figure out exactly how far the sword is thrown. Put the pointer on that spot and click at the right moment. It's hard to get it just right but once you do those obstacles are a lot easier until the game speeds up.
The only problem points I see are the double pits and the big thing hanging down. You have to time the throw just right so the stick/sword lands between the two pits for the former. For the latter you have to time it so you roll under the thing. This wouldn't be such a problem but when those come at random you can't prepare for them which means you can't practice your timing. I'd like to be able to do training runs with only certain obstacles.
Wow. "Gears"? Really? I assumed from reading the guide that this was some sort of steam-punk world. Oops. Turns out it's just a failure at pluralization.
3/5 for me. Nice, new twist on the old "copter" game. I also found the camera to be excessively heavy. It wasn't really a problem until I had to use it on that one long cave that was dark. My biggest complaint is with the randomization. While it's nice to get a new cave each time, the fact is that you might get an extremely difficult cave with many narrow points and elevation changes and not have any coins, then when you retry it you get a mostly wide and flat cave with plenty of coins. The same level can be completely different in difficulty.