It seems like we had quite similar ideas! Great entry, especially considering it was made in PyGame by one person.
The game looked and felt very clean, and the effects and particles were great. The grenade launcher in particular felt really satisfying to use since it took out enemies in one hit and had that jolt of camera shake when the projectile landed. I think the small arena size was a good design decision to force the player to dodge often.
I do think most of your player projectiles could stand to travel faster. I find it’s usually less fun to make the player “aim ahead” of enemies much except for the occasional slow-but-deadly weapon like a grenade or rocket launcher. I can’t recommend enough watching the Vlambeer “The Art of Screenshake” talk if you haven’t already.
It’s a nice detail that the weapons are color coded, although I kept forgetting the numbers and colors and died while trying to peek at the sidebar. After some more time I probably would have gotten the hang of it.
I will say I’m not usually a fan of Bosca Ceoil music, but in this case your music was very well done and it worked great with the rest of your game. The visual and game design felt very much like an old arcade cabinet and the low-bit sound and music fit that aesthetic neatly. I especially liked how you added more layers on top of the music after the player beats the tutorial.
Congrats on making this in 48 hours, and keep on giving PyGame a good name!