Well done! There is a lot going on here lol.
I liked the idea here: something happened and now all video game worlds have been smushed together? I recognize a lot of the stuff in here, but some I can't place lol. As it is, it feels pretty difficult to play. I died in the second room because I couldn't click on a teleporting enemy before he disappeared. The player bullet animation was really confusing because it wasn't immediate and took a long time to hit the target. For a "shoot" action, players expect something super responsive since this is their primary tool for problem solving in your game. Also, the multiple post-processing effects on the screen made it really hard for me to tell what was going on. All the colors were too bright and washed out to make out a lot of the contrast quickly. And for some reason your start button wouldn't work for me. I had to just spam clicks in the general area before it actually worked. Usually that happens in Unity when you've got multiple canvas items overlapping each other.
Do you have your remixes for this jam posted anywhere? I'm always down for a megalovania remix and I suspect those two remixes got a lot of your attention. I want to appreciate them!
Thanks for making this and congrats on finishing the jam!