Thanks for rating and encouragement.
You are right about gamefeel. I'm aware that I usually prioritize game systems, so that animations and stuff like that come last.
Different trash already produces limited kinds of materials and you can tactically try different mixes a what materials you can gain from them. In the next version, there will be a possibility to refill your recycler in certain level of matter in it with a single Trash only, so you would get even more control over what matter is added. Yes, different Invaders would deserve some sort of personality too.
Traveling between planets and implementing events (even a hint of a story) is something I definitely considered. I'm a big fan of FTL and STS, so I always wanted to implement a system like this. But that is a lot of work and I also have another project in the works and I'm not sure if I'm ready to abandon it for this one at the moment.