this music make me want to play undertale again :v

That was fun! It was smooth, the control was good. The sound was just right for the game. the music was fun. I really liked the minor detail of the gun pushing you back just a tiny bit every time it fired. It wasn't huge, but needed to be paid attention to! Nice work. I would enjoy a longer version of this, perhaps with more weapons or enemies. For two days, you blew this one out of the water!

So simple, yet so good.

I'm surprised that the game is wonderfully fun! I like fun games. :D

Now for the review.

The game may look bad but I think it's on purpose as you said it's made in one day. The gameplay itself is a rage game, which I will say, I like it. If you make a game that little bit easier (Able to turn around and shoot and proper control) or just make it harder (Traps) or any addition, or just leave a game like that, I don't care, It's your desicion anyway.

Keep up the good work pal! :) You just got a save!

-Nonood Whatever

Actually pretty good!
The ‘action flow’ is enjoyable – a lot of enemies which are easy but satisfying to kill – but they also jump and drop from the top of the screen, so you have to be somewhat wary of your surroundings as well. The slow-mo death sequence is pretty neat, too.
The pixel art is fine, although the black outline is inconsistent – sometimes it's used, sometimes it isn't. The texts also look a bit blurry.
But checkpoints should preferably be in a safe zone, not "0.5s after a respawn to react"-zone.