I posted my game in the feedback thread in this forum and got some valuable feedback. Now I intend to fix the issues and I plan on starting with:
1. add sound effects
2. build some kind of road so the player knows where to walk
3. Fix a bug(bullets stack up when shooting at the building)
4. Have a look at player controls, probably make it possible to rotate while shooting and maybe even shoot with mouse, I will also include so that you can control the player with WASD.