super well-polished and charming game!
the one thing that stood out as most improvable to me was on-boarding for new players.
since the game starts immediately with a countdown and being attacked, i felt like i didn't have time to figure out the controls in peace. i think it would be better if the controls were displayed/explained in game rather than the escape-menu. and i didn't realize how to base-build until it was too late. so i ended up playing 2 throw-away play-throughs just to figure out what to do. ideally, i would have been able to learn those things during my first play-through. before the actual challenge hit.
but otherwise i'm super impressed!!
edit: oh yes, and use/melee being on 'F' was sub-optimal imo because it prohibits me from running forward-and-right while doing melee action.