Very well done
Seeing as creating arena shooters is what I seem to do more than anything else, I thought I would give you a detailed review of what I thought about your game.
The game felt very well made, responsive and action packed which is everything an arena shooter should be, the firing felt powerful, and killing the enemy bots was pretty pleasing.
Using bitmapData for the rubble (I assume that’s what you used because you would get some serious slowdown otherwise) is always cool, and it was great to see just how much damage you were doing.
Some nice powerups to help keep the variety up so it didn't get boring too quickly.
Although nothing was really 'bad', there were a few things I didn't like too much, or thought could be improved.
The whole momentum/physics thing felt a little too loose, it was nicely done, but I didnt like the way it made the bots feel light and caused me to be flying all over the screen when I didn't want to be. I think if you just made it a bit more solid feeling it would add a lot to the gameplay.
The first enemies seemed to be more difficult than the second ones. Ok, so I'm guilty of this in Neon 2, so I can't judge you for it, but just seemed the second enemies were a bit redundant.
I didn't like the way the objectives were just 'kill x number of bots' etc. I only got to the 3rd objective (see below) so if there was more variety you can ignore this, but I think objectives such has "protect a worker bot while it repairs 'insert something here'" or "Destroy the 5 reactors" would have made the game far more interesting. It just felt like the objectives were a bit meaningless as it is.
I couldn’t complete objective 3. The mission objective was (I think) Kill the red boss, and I did, but nothing happened, I just had to keep playing, and after killing about 320 bots I quit.
Anyway, that’s my thoughts on it. Like I say, its a very well done arena shmup and I like it a lot, would have got a 10 if it wasn’t for the issues above. Hope I will see another one from you in the future. I've been told I should make a Neon 3, so you might be seeing another one from me too!