A major flaw is that railway endpoint may be obscured by boxes and become unable to be relocated. A another flaw is the "fogged" skill tree.
myocytebd
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Goblin warriors fought bravely, but villagers are without number (ºΔº)
Since player is the swarm, I would suggest giving goblins stronger regular units to part/penetrate the swarm.
And champion/king could have some skill to do high percentage damage (e.g. king save progress and can wipe out swarm for a few times).
For example, I ran into these bugs in a single run in 0.2.2 download version.
1. Golems don't trigger events.
2. Pickaxe doesn't unlock. Its unlock condition doesn't make sense -- instead of reaching rock depth, it requires acquiring rock. As a side effect, golems will never unlock pickaxe.
3. Golems cannot remove snow.
4. Golems eventually stopped dealing damage to blocks (at 3xx white blocks metalic-heart). Depth remain same, and statistics doesn't change. Statistics occasionally update, possibly due to the tiny chance super crit (golem damage rate < 1% player damage rate).
5. Golems statistics is probably too low.
23 is old bugs since 0.2.
1 is one of the reason that 0.2 golems are so underwhelming (and pickaxe bug).
There was some old bug of blocks keep being unknown on acquiring, which might get fixed in current version.