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I think you didn't use the gun theme on it, but in general it's a good start. As advice if you do a short game like this may you build it as a web game, better for easy and fast rate, and adding a portrait img to give your players an idea of the game, with screenshots if needed

It's a free tileset, credits in the game's description :)

Thanks for playing! I could put more time between enemies' spawn, but my idea was to give a faster gameplay and instant recover for players. However, you're right, I'll consider putting an easier start :)

my bad, I just uploaded the fixed file again