Good shot!

It's extremely floaty! The square tends to roll when you are trying to slide... When the player dies you should zero out the velocity of the ridged body. Also the "lava" is way too punishing.
The difficulty ramp goes from zero to impossible in 5 levels. The wall climbing feels very janky. at one point I was stuck on the ceiling, and another on the invisible level boundaries, which I would also do away with. Instead of making the player deal with the squares simple physics not doing what is expected why not make the player controller act as you would expect a platformer player controller to work. there are some great classic and modern examples to pay attention to that may offer a slew of resources depending on the designs goals. Or of course you could go the other way and bring the floaty physics design to a new space outside of platformers. The two don't really go together. If you are trying to do a floaty platformer then I would look heavily at donky kong country's player controller and level designs. It can be done but most platformer players are in it for precision these days.

Nice work on the design of the first three levels! Keep up the hard work! Best of luck!

Like Brain-washed mentioned, the bullet range is a little short. but there are a few other things going on here. The player is large in comparison to the playing field. There is not enough drag on the player controller. there is not enough general feedback in the game. it feels like the square is rolling. the jump feels very weak for a 2d platformer. wall jumping doesnt feel good. The controls are very un-intuitive. I would default to space bar being jump, and using Z and X for crouch and shoot would be fine. having those three in a seemingly arbitrary order is actually hard to remember. You want to crouch but jump. Platformer pits traditionally have lips to them, and platformer designers usually allow the player some coyote time. Here if you go over just a hair you are dead. I would spend more time studying the tropes of the genre and decide what this games core is.

The visuals look nice! its simplicity works for it! The crouch felt very juicy!

Awesome work! What would really make the game is if the face were animated! Since you are leaning in to wonkyness... Why not lean into the distractions in the level! I feel like there should also be some type of feedback for the jump. also you should put jump on space bar also since that is a kinda go to spot for jumping. The audio is great, but a little repetitive. in a game where you die a lot making the death interesting goes a long ways! Best of luck!

Looks fantastic! Nice work! also its great seeing the process!