The idea is cool, implementation not the best, could be better - Game loop is a little boring and confusion, at some points kind of frustrating because the grind is very boring, it takes a lot of effort to progress just a little bit in the game, and there is not "instant" gratification
I think some kind of passive skills could improve this game a looot, also map is very confusing - I'd love to have ability to setup some waypoints marked with colors, so I can be guided thru walls - also see distance
Setting of spawnpoint doesnt work, worked once for me but in general I am spawning at surface
Mobs are quite boring / annoying - they are either very passive, or very aggresive in a way that can't be avoided (like these worms going thru walls, like in terraria but in terraria you have ability to attack them thru wall with special equipment)
I am holding thumbs for the developer because it's definitly created with passion, one of the most annoying things is self-harm when you use weapons too close, I understand that it should be punishing, but there could be some threshold, for example small regenerative shield (could be developed in passive skills)
System of sending resources in rockets seems a little useless, at first part of game you won't be able to finish it, you could if you'd put 200% effort, store things in containers and prepare for it - but for what? Rewards are kind of symbolical, it wont push you in progression. It could give you either passive skills, or some wepons, or maybe some enchants for weapons
I need to point, that I didn't progress in this game a lot, and there's much more content, anyway I feel that I wont play more (maybe untill some bigger updates), again good luck with developing, hope you'll success :D