I appreciate the effort put into this, the concept is cool and i thought the grass was nice, fitting the shape restriction. for some feedback, i'd recommend adding an ending, since at some point there was just empty grass for me. the grapple mechanic is interesting, but the controls were abit stiff. maybe make it automatically launch you instead of having to press w. After the first section however, there were no longer any grey circles to latch onto, so perhaps these should have been added throughout the level.
For background music, a longer loop would be better as it gets tiring to listen to after a while. The levers to open doors was a good idea and the door opening effect was nice, although i didnt realise thats what you meant be levers at first (understandable as there is a shape restriction) i think the sections are what is theme relevant? gg.