Surprisingly fun little game! It's really clear how much your skills improved over the course of the game, too, from the game eventually getting sound effects for the portals and eventually proper music and scrolling.
However, I didn't really get that the grapple connected to the closest hook to the player until a few levels in. I also really wished the jump height was based on how long you held the jump button, so you could keep the high jump, but do shorter ones for precision.
Other than that, though, the game's great! I really liked it a lot, and I wish you luck on making the deluxe version!