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Clean, simple, brain-challenging. Exactly what a puzzle needs. Don't listen to the people telling you to add more stuff of the same kind. In a next release go for something new (e.g. feeling hunted: something is trying to catch you, bonuses or an upgrade system.)
Suggestions: Make the base heal in percentage of hp / s. Shop should always be there or have a timer/progress bar. At one point the enemies of pabulum pit are too weak. I went back to farm at the goblin gardens until I could finish the dragon because with the smaller space, I earn more there. XP is earned by the fighters --> They should auto-level and get the xp by kill. Add some easter eggs into the maps. I clicked everywhere because I was expecting some, but didn't find anything.
The last levels are really challenging. Overall a really nice game, coloring, game functioning etc. Love it. A tipp: If you are near the front line, you won't get surprised by black floors that often. And try to take the producing glasses early in a fight.
Good game, but you can easily make many important changes like e.g:
Give the houses signs; put the staff and management together; Make more design changes as you progress; More upgrades like ropebelt conveyors; Salary is better than slavery; balancing (sluice box); story; Did I forget something? Go for an awesome game instead of a good one.
They're electric crystals, that's why houses get powered when they get crystals!