This is definitely a strong start! The art has a really strong direction and the gameplay is clean.
- It feels like 'camping' is very much incentivized, especially in places like the bottom left library node. The only thing that really kills you is being unprepared, and having a huge amount of walls to hide behind on demand makes makes it easy to game the AI a bit.
- The first two enemies are really fair, but the archers are pretty spooky. Archers killed me the vast majority of the time just because they react so quickly and efficiently. They're a big part of why it rapidly becomes less viable to just turbo run around the map and go on a killing spree, which feels like it isn't what you're going for.
- I'm not really sure what the ingame weapon upgrades do. I'm assuming the magnet is pickup range
Still, this definitely has the makings of commercial potential; You've got a fun hook and cool gameplay in a tight package. Best of luck with development!