Solid entry! The artstyle is pretty good, the music has a good chiptune aesthetic, the personalization is great, and the main mechanics are very well done. The weapons are really fun overall (I specially loved both the flamethrower and minigun) and the 8-way aiming is always good to see!
Level-design wise is really solid, although some polish can be done in certain areas (like those long corridors that are esentially empty).
My small nit-pick is that the music can get a bit repetitive due to only having one song, but the sound is good overall, and the enemies could give more feedback once they are damaged. I spent a whole weapon trying to kill the yellow giants before knowing I had to shoot them right below them lol
Overall really good entry! Had a fun time playing it! It's always great to see a good run-n-gun. ^^