Haha, the helmet does look a bit like the Helldivers ones, but it’s pure coincidence. I wasn’t familiar with Helldivers until I saw your comment and checked it out.
I’ll make it clearer that destroying a planet gives you extra Dark Matter.
For the traps, I agree it doesn’t make much sense for them to stay once a guardian joins. Your idea with Yuki’s gun is fun, but just going through the trap a second time might feel too simple. I’m thinking about adding something like close combat training so you can actually counter it properly. The other traps will probably need their own requirements too.
I’m already working on expanding the gameplay - more stuff involving the guardians, planet protection events, and overall story.