This game seems like it has a lot of potential with a bit more polish!
The mechanics seem to be really fun. The rocket jumping plus the glider seems like a pretty cool set of mechanics. The rocket in particular feels really powerful and cool!
I didn't find the grappling hook to be all that intuitive or useful. Maybe you could add some shorter levels before the levels you already have that ease the player into the mechanics. I used the grappling hook once in the tutorial and didn't make the jump so I had to get back up using rocket jumping.
The jump feels a bit finicky, cause it has like a start up time where your jump power is lower and then it boosts up higher.
In terms of sound, the game feels a bit empty. Some music and more hard effects would've made this game a lot more enjoyable.
You seem to have a very good grasp of particle effects! I liked them quite a bit.
Keep up the good work!