You and I have very different definitions of "very bad condition". You have a really good foundation here. I like your pixels - great scale for the 64 resolution - everything is readable and the viewport isnt too crowded. If you do continue work on this, some simple things to consider adding:
- This game could greatly benefit from a "shoot/fire" sound effect and a "hit" sound effect, at minimum. If you didn't add any other sounds, those too would help provide so much feedback to your players and they are pretty simple/basic sounds to come by.
- Camera shake is pretty easy to add (you already have a nice working camera system in place) and adds so much to a shooter.
- Push Back. For enemies and the player when they get hit. Possibly to the player when they fire. Again, adds so much feedback and "weight" to the gameplay.