This is awesome! Loved discovering the many ways you found to obstruct progress on the one dimension and all the tools you provide to get around them - particularly the timing challenges that come with the narrow tunnels!
I did find the consecutive tunnels pretty challenging though - maybe some indicator of where they're going to spawn (maybe with a dotted outline or something?) could alleviate this somewhat? That way you'd only have to worry about the timing and not also be required to remember where the tunnels start and end!
Regardless, very nice job!!