Overall great game! The controls were user intuitive and the puzzles were entertaining and somewhat challenging. Good luck on the contest! ... Side note - fantastic ending ^_^
Here's a tip! Buy the Arc Spread as soon as you can. This will get you through all the early levels. Once you have saved up enough, buy the lightning. You can't aim, but it will kill everything allowing you to gather up cash. This should allow you to but the vortex and big laser by level 22. Now you don't have to worry about money anymore! Vortex then laser on cool down, and lighting the rest. Hope this helps!
I was going to write some amazing comment, but emfinn really summed it up. I really enjoyed the game, until the hundredth time that I died cause I got unlucky... Sorry for whining =/
P-Bot is EZ mode for the easy badge. Just spam "d" after you jump in the air. I was having so much trouble with other characters, but as soon as I tried P-Bot, I got a 12 string combo.