This is a cute little retro platformer. The 8-bit sounds match the assets and overall visually it looks cohesive. I'll admit the movement is jank and slow and some of the controls can be finicky. But for a game made in only 6 hours, this is admirable and a good prototype practice. You did well with the time given.
I'll admit I kinda wish the movement speed is faster and the laser shot feedback PixelMetalWolf I noticed as well. You can't target diagonally upwards too, which is kinda awkward. Upgrades were non-existent and first aid packs are in abundance so I hardly got any chance of a game over.
Overall, an admirable effort made. Not my type of game but I respect the result that you did with it.