Pretty solid game! The game may look easy but it's actually quite challenging (at least for me). I'm not really a fan of the art style but in all honesty, it's pretty charming. The music and sound effect goes well with the art and gameplay. A few things that I want to say, the UI could use some improved design in the future too (it's kind of too basic imo especially the health/ammo bar). Other than that, displaying enemies' health would be helpful even it is not really necessary. One other thing, perhaps an indicator that we are run out of bullets would be a nice touch since I'm often didn't realize I'm out of bullet before switching between characters. Powerups for the gun would be a nice touch as well. Above all, this is a pretty solid game, well done!