Ooooo. I really liked your sprites and your tilesets. The little particles from killing the enemies, with the little screen shake from firing your gun made everything feel really nice. I am really appreciative of you having some dead air time for jumps. That last little jump you have to do before getting to the last goal was really tricky until I realized that you allowed for some frames where you could input a jump input while falling. That was really smart of you to implement, and that's a good mechanic for games like this.
My favorite bug I encountered was that when you die, you can still fire your weapon for some time before it resets the level. I know it's not intentional, I just love little goofy stuff like that personally hahaha.
The only thing I didn't really vibe with was the default controls. This jam is really tough for me because I don't have arrow keys on my keyboard, so I am really reliant on people having the option of using WASD for their games. Thankfully you graciously decided to have that in your game, opting for "A/D" for you movement. The only issue was it made using LeftCTRL a little awkward to shoot using that movement option, but whether intentional or not, I found that I could use left click to shoot as well, and it instantly made everything feel a lot more comfortable.
If you added more content; levels, variety of enemies, maybe different guns / powerups, I could see myself playing more of this easily.
Well done!