Bullet with their own physic are great but an ending screen or one or two levels could have been great since I thourgh I didn't get all the enemies

This is a cool little thing. You made something really simple and I think it's pretty good. The shooting is, yaknow, pretty basic but it works, enemies are the same, basic but works. I would have loved to see more polish, because that always takes shooting to the next level. The movement blew me away, it feels really good to move around and the mouse aiming works really well. 

A few notes:

• Collisions are kind of messed up. There is probably a way to make collissions "better" (making them unable to pass through objects even at high speed). I don't know what's it called, I only know it is a thing in unity. 
• Randomly spawning enemies would've been fun, and is not that much work to implement. 
• I love bullets