Good good good!
I like this game but i have suggestions to make it better!
Maybe there should be more type of monters and also a side-scrolling platform. Add some boss or ennemies...You seem to time how long we can hold then like a 5, 10, 15 minutes, etc.. Add a boss!
Also i had toruble changing gun btw...is it because the weapon i choose had no ammo? Maybe we could see all weapon in a HUD and highlight the ones that still have ammo.
Good one, make a sequel!