Wow, yeah, like Aspark says, this is a great comment. I have some good notes:
First, I'm really happy that you pointed out that refund bug. I wasn't aware of that, and it was quite an easy fix. So that will be in the next build. Thanks!
Second, I've also fixed the shooting through walls bug. I too had some hesitance on fixing it, as it was kinda fun. But it feels unnatural and that type of thing causes confusion in players. So I'm going to go with removing it for now. I'll be testing that while working on the next build.
I have a lot more to reply, but I want to say that your comment + Aspark's request have encouraged me in getting an official Discord going. I'd like to have this kind of discussion early and be as back-and-forth as possible. I will probably be doing that this weekend. I have so many exciting ideas (I think) and I'd like to have them in a centralized place that the community can view and input. So look for that soon and I hope to see you there.
The Piercer - One of the changes I'm contemplating is changing this to be The FOG Piercer. It will pierce Fog, but only Fog.
Amplifier - Looking at turning this into The Void Destroyer, and having it only gain a damage boost vs. the Voids.
Global Node Design Change - I'm looking at nerfing the overall flow of the nodes. I mean simply only allowing 1 effect to pass from node to node. This means that Piercing would overwrite Amplifier and Amplifiers wouldn't Amplify each other, etc. I also have other types of nodes planned that I think will be fun.
This is where the Discord discussion should probably start!
Lastly, I'm so happy you took advantage of the custom settings. I rolled that out for fun, hoping for this exact situation, that players show me their custom settings, and I can learn from them. I tried your settings! They are hardcore, and I might even upload them as part of the next build, labeling them as such. It's a unique and challenging way to play the game.
It won't be soon, but one goal is to have these shareable between players, along with custom maps.
Anyways, thanks again for the comments and bugs. I'll be getting back to it this weekend. Look out for the Discord soon.