Well done!

Letting the weighty mech through the air with the grapple feels really good.
The retro art style fits the exploring unknown worlds theme really well.

Some Feedback

• I think it would be cool if I could control left and right grapple separately and look around while I'm grappling. This would let the player scale the environment much more dynamically. If you keep on working on this I would suggest you look into the games Grow Home and and Grow Up. There you have to climb stuff with a robot by controlling each limb.
• I didn't really know what to do while playing. I just assumed I need to find the monoliths and jump into portals afterwards. The user interface of the mech is a nice place to add information for the player what todo next. Eg. "Find next monolith" or even a picture.