Cool entry! I enjoyed your little intro cutscene at the beginning and the music was pretty neat too. Some pointers:
- Felt like the atmosphere of the game could have been improved with a background rather than just a solid purple color. You could have added to the atmosphere also by adding more tiles to the tile set, it felt like while platforming there wasn't that many
- The charging of the gun was a nice idea, and I think you could improve it by adding a bar above the player to show how close they are to fully charging the gun
- I noticed your cutscene firstly was a bit long, causing me to wait to finally be able to play. I also noticed about the cutscene that it seemed very polished compared to the rest of the gameplay, my suggestion would be to focus more on polishing the environment the player is in, as well as the player mechanics.
Overall though I enjoyed your game and the story, and played it for a good bit, nice job :)