Very good, but too bad there's no save option...
As I and other people told you, who cares about metal slug and other games of that kind? It took me a lot more than half an hour to finish it due to the lag I encountered, and if I had to go to poo or something it would be very annoying to start again. It's not very complicated, you just need to make sure the variables aren't messed up and save them within the hidden files. Too bad...
Other than that this game is very entertaining and weirdly doesn't get too repetitive fast. Without all the lag I had to go through it was very fun to have those shotguns with doubleshot and big water 'bullets', good work. There seemed to be no glitches and the art was superb.