The game does certainly have some charm to it with its odd presentation, quirky text, and weird premise, but unfortunately in the end, I found the gameplay was shallow and repetitive, and those same wacky visuals actually worked against me.
The biggest killer for me was the lack of feedback: without any strong sound or visual effects for shooting enemies and other actions like reloading, everything just felt so muted and dull. I couldn't tell how much damage I was doing or if I was making any progress at all on the enemies, making them feel so spongy and lifeless. Without feedback, combat quickly lost its luster, and it didn't help that the enemies were lacking in variety and all of the arenas felt so cramped and samey. I tried my best to inject fun by using the dodge roll and charge shot, and the boss fight was a breath of fresh air in terms of having some fun patterns to get around, but it was too little. And as hinted at before, I found the colors and filters, while interesting at first, to be a bit annoying later on as it hurt visibility.
Just felt like a case where a small amount of content was stretched too thin by creating too many levels, though luckily not too many that it stopped me from beating it. Reading all of the dialogue and notes at the end made me glad to hear that you are having fun creating these games. I hope my feedback helps and is not too overly harsh, as I look forward to seeing your next entry!