This is a pretty solid entry! The metroidvania elements are there, and the player being a slug is interesting to say the least. The art isn’t too bad, and I appreciate that there are at least some sound effects. I also like the levels and the fact that, as far as I played, the player can’t really get stuck.
Perhaps the biggest issue with the game is the camera. Once you get the super jump, jumping up into the area above causes the camera to switch rapidly to that area and that hides the platforms the slug is jumping from and onto. This is frustrating. With Godot you can set the camera to follow the player but have a drag margin set so that it’s not following the player character’s position exactly. This should allow platforms to stay in site but the camera will move when the player moves from an area enough. There’s also the limit properties too you could use to bound the camera’s view to keep it within the level.
It would be nice to have the player stop it’s upward motion once the jump button is released. This would allow for smaller jumps and better control.
A very small issue is that the character returns to facing the right when not in motion, even though the last movement was to the left. This should be an easy fix.
A common issue in this jam has been the lack of support for left-handed players. My advice is to always support the use of arrow keys along with wasd. This is super simple with Godot. Just add arrow keys to the input map actions in your game. Also, use the physical key event type for wasd as other countries/locals use different keyboard layouts. (This is for wasd - I think arrow keys are pretty much universally located.) I also recommend the support of a controller too, which is also pretty simple with Godot: all you have to do is add joy button bindings to actions in the input map. If you always follow all of this advice, then everyone will be able to enjoy your game as much as possible!