Really cool twist on a frog eating game! The node structure is a really cool gameplay mechanic that allows for quite a bit of experimentation. I really enjoyed both modes you added; I managed to get a time under 1:00 in Time Attack and had a lot of fun with Endless!
One thing I did notice in Endless is that when you spawn a node, it always spawns in the exact same spot, which can be a little tricky when the node structure starts getting larger and you have to travel more to reach the new node.
Besides that, really great work!