This is a nice arcade game with some banger background music. I'm impressed at how you were able to make the map endless (or at least appear that way). The only thing I would change is allowing the player to hold down the mouse button to continuously fire at the same rate as spam clicking.
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Thanks! The map is actually endless by loading a grid of world tiles around you and then deleting the ones behind you as you move and generating new ones ahead of you so even if you double back you won't get the same terrain and run into any possible "dry spots" of enemies. Ooh holding it down to fire is a good idea!