All bad all the time.
The difficulty curve goes from non-existent to retarded around level 22.
You added combo waves yet the timer for the next waves is so long that the combo dies out before you can put it to use.
Gold vs Level pacing is broken. Expecting people to grind previous levels for upgrades which feel like downgrades does not make a good flash.
The rockets were WORSE than the cannon.
The AI doesn't exist, enemy waves had no thought behind them...there is no reason to fight level 1 enemies beyond level 10.
Seriously, you're going to put level 1/2 enemies as they final wave in levels beyond 20?
The difference between enemies in 21 and 22 is most likely the biggest flaw I've seen and that's saying a lot seeing how I encountered at least 4 different bugs while playing.
Next time take a moment and actually play what you made before release. As it stands this isn't even worthy of being a time waster.