This game is awesome. If there's a sequel... clean up the interface a little. Buying and then equipping at the shop isn't streamlined (please :) 5/5 game !
add autofire feature. clicking kills the game (and my hand). if autofire is lame, add an upgrade system for autofire /on /off and the more you up autofire, the less time between bullets fired. clicking really gets tiring fast. good game otherwise. TWEAK it :D