Obviously a game from this developer would be pretty polished and appealing, and I enjoyed the concept, but didn't quite love the way it was implemented.
I'll start with my issues and then follow it with my praise.
Personally, I thought the "Crowki-eye" view was too small or positioned weirdly in the UI, and found it frustrating trying to split my attention between it and the aiming view, which (at least in early stages) is less important. I think this is the kind of thing that is easy to address (in that there's nothing inherent to the game that makes this a problem), but is difficult to actually adjust (because people are different and so many little tiny tweaks can make a huge impact on experience). I didn't personally find the gameplay to be that interesting, but that may simply be about the frustration of the screen-juggling/my personal preferences in puzzle games and I'm not docking points for that or anything.
This one made my computer fan go "VRMMM," but, as the page indicates, you're aware there are some spikes.
Okay, the praise part.
The ambience is great and it's clear that the developer just "knows" the kind of humor or style that fits well with VTubers in general and is coming at this from a fan perspective. It's very game-y in a fun way because it's approaching things "gameplay-first." (Why shoot at barrels instead of just running toward the dragoons and grabbing them? Because that's the gameplay! It's a puzzle game!)
The theme of chain reactions is incorporated very simply but quite thoroughly, which is harder than it sounds, because making a game jam game about "chain reactions" could quickly become much more unwieldy than desired. I would be a little surprised to learn that anything major was cut from the initial vision of the game to this. It seems scoped cleanly and neatly.
I know a lot of the assets (music, models) are third-party things, but I thought they were chosen very well. The main menu theme is a great find and all the pieces are used in a way that coheres.
This game has my favorite implementation of a reference that I've yet seen in the jam (working my way through the queue) and for that alone I think it deserves a medal. It's a very simple, elegant joke deployment that made me smile.
To summarize: I thought the game was nice, nailed the brief and a particular sense of humor, and was quite polished, but personally didn't vibe with it much, possibly because of some UI issues or possibly because it's just not my kind of puzzle game.