This game looks nice and the player and double jump feel good. The levels were a bit plain, but still enjoyable.
Shooting is the one thing you can do when both halves are together, so I would have liked to see that as part of the puzzles - like shooting a button, or if the destroyable walls were used for puzzles. I didn't feel like the enemies were necessary, they felt separate from the split/join mechanic.
I recommend this other jam game that was similar to yours if you haven't seen it: https://supertry.itch.io/assembloid