hiya, i said i'd give a few pointers, so keep in mind i'm being overly harsh:
First off, your UX could use some work, there's a few little details here and there where, as a player, you'd expect things to work one way, and they work different.
For instance the intro text progresses only when you press enter, i might expect other controls like space or z/x to also work, or even just any key, and the way the text is laid out "suggests" that it would automatically progress
(usually there's a small visual indicator, like an arrow or dots to show when you're expecting input to progress).
Second, the control scheme isn't very intuitive, and there's no in-game way to figure them out, even just a static screen on the pause menu could help a ton here, and you'd usually expect to be able to return to the main menu from there, too (that also means there's no real way to exit the game other than alt+f4).
I also seemingly couldn't use the grappling ability at all? and by that i mean z and i didn't seem to do anything, so that made the start of the second level an almost impossible jump to pass.
Finally, the music feels a bit harsh, and the same is true for the graphics, mainly the tileset has a little bit too much contrast between the gray and brown.