Solid mechanic. Nice game overall.
As was mentioned previously the beginning of the game was actually way harder than the end, because with all arms equipped, you did not need to aim really, which i think could be one of the skill expressions in this game.
Though, i also liked the aspect where certain apendages would need to be carefully attached as otherwise you would have a harder time climbing the hills.
Since there was no shop (or i missed it), it seems one is better of just ignoring the minor enemies and run past them as fast as possible.
I wonder if this could work even better in purely puzzlegame, without enemies like that, or maybe only the boss fights, but the primary mechanic being figuring out how to combine the correct tools correctly, to be able to perform the required maneuver.