Hi, this game is amazing, first off, just want to let you know. Don't know when you're planning on finishing it but I'm excited to see how you'll do it, I'll definitely enjoy it even more when you're done I'm sure. You're doing great work.

Now to my question. How does Summoning work? I was wondering since I got to the point where Rodolphe joined me and mentioned that he would go with me to deal with the Toad King, but whenever I get to the swamp and try to summon him, I'm not sure how to do it and it doesn't work, all it does is click on the way to the Toad King and I get that ending. Please let me know in general if there's any further ways to progress in this game (I'm pretty sure getting to the upper level with the janitor is the furthest you can go, but I'm happy to be wrong). 

So TLDR; I'm not sure what summoning does or what situations I can use, including situations where Yuvee may be useful, I have no clue.