Let's get the negatives out the road first.
I think that the player movement was a bit slow, making it hard to dodge the thousands of bullets flying at you while simultaneously shooting and picking up the corrupt files. The collision detection was a bit weird, sometimes I'd get hit by a bullet but it wouldn't register, and other times it does. When an enemy hits you with a bullet, you don't get a short amount of invincibility time, so if one bullet follows behind another, its an instant game over, with no time to react. I managed to reach the boss but then not long after a bug came and killed me instantly, perhaps you should have made it so that they only take off one heart and then die.
Okay, now with that out the way, let's talk about the things that I really liked about the game.
I love how you took the theme, I think it was really unique and I loved the idea behind it. The game was very challenging and fun too, I think you had the difficulty balance was just right. I liked the games music and sound effects, it fitted the gameplay and artwork nicely. I also loved the inclusion of controller support, the game felt great to play with one! (I used a ps4 controller). I found the joke at the start about the new virus known as the "coronavirus", I thought that was quite funny.
So overall, what are my thoughts on this game? It was fun, unique, and I definitely enjoyed my time with it! Well done!