The image for the game is very nicely done! From reading the comments you ran out of time for the upgrades and the monies. I know how that goes! Game play was a little slow in the beginning to where I nearly quit. I then experimented letting ppl past and shooting them in the back as they got stuck there. Id recommend adding sound effects and a little UI feedback of player status. I fullscreened the game and could shoot off to the side, use the full resolution for the game