The art is great and clearly someone with some talent worked on it but as a game development project, there is nothing here.  You move and shoot, just barely.  It's such a minimum effort it's disrespectful to the clear effort of the artwork.

Loved the art!

- Thales

The player is too slow, the bullets barely do any damage (i had to spam left and right click to be able to kill something), the bullets despawn too early, the player can't die, the enemies sprite should flip when going right, you should add a walking animation, the gun holding animation is really good, i can see the outside purple part of the map, the pick ups doesn't seem to do anything. The art was pretty nice.