Mousetrap jump felt really satisfying.
I've got two cheeses (no idea what they do) and a big jar (also not clear what it does). Not sure if it's intended that enemies don't respawn after your death. Glad I didn't have to fight them again though.
I have found 1 invisible ledge and one place where you can almost jump on but not quite.
Mousetrap jump and the mouse character itself are the highlights for me.