Edit: The lag seemed to be connected to the amount of active quests / quests available from NPC's. After turning in a few quests (maybe 5 or 6) the lag mostly disappeared from Bavelock. The mouse trick still worked though!
In large cities (e.g. Bavelock), the lag was almost unbearable. Then I discovered that I could lag myself through walls by just mousing over the screen for a second: Broke into the thieves' dungeon, stole everything, lagged myself out before they saw me. Great fun. 5/5 would lag again.
For anyone who's wondering when it will end; there are three areas, with each subsequent area being twice the distance you've already gone. If you've just made it to the final area, you're only a third of the way done.
Badge took me several hours of grinding passive upgrades. I advise just kicking M.Critter and then leaving to do something fun while he gets you experience points.
I really enjoyed the game but the AI is horrific. Friendly troops are too enthusiastic and die immediately, while enemy troops won't move even if they're being blasted by shells. It was far too easy to sit outside their range and just slowly destroy their forces. This strategy works for all missions, and so the game felt slightly long and extremely repetitive.
Apparently the developer has already thought about the colourblind problem and you can choose colours under the options tab. Wish I knew about that earlier, but kudos to the developer for thinking of everything. Very fun game.
Urgh, Rattlesnake on colourblind mode is incredibly difficult. It becomes nothing but an increasingly frustrating memory game. I know I'm part of a small minority, but for future games, could you please choose colours which are more different? It would be much appreciated :)
I managed to go the whole way through the story without realising that there is a shop where you can purchase upgrades. However, after failing survival mode at wave 24 and reading other comments, the sword upgrade was much welcomed. The extra 60 sword dmg from the 300 unused souls in survival is wondrous.
Combination that worked for me:
Front row: 2 warriors
Back row: 2 mages with full magic power and full chain effect
+1 point to spend at your choice.
Let the warriors block the mages, and let the mages do massive amounts of damage. (Some difficulty against archer level)
For Darwin Mode, I was originally running around, casting spells at boss then healing, but qqwref's strategy works wonders. Just stand in one place, jump high and slambomb repeatedly. Made it so much faster, thanks qqwref.