From a little testing, the game only "saves" progress when you defeat a new trader. Upgrades between traders don't get saved if you quit the game/refresh the page between them.
A nice, quick intuitive game. ...We don't know who the laser-shooting guys are, but I do feel somewhat bad by getting rid of them, switching over a chasm to make them fall to their presumable DOOM.
Just so you all know - you CAN repeat levels to get more coins. Just repeat level 1, and you'll get the badge. Silver lining - the coin amount updates *as you play* so you don't need to finish the level to get the badge!
@Ishidakun If it's the right staff I'm thinking of, it only drains on Critical hits, not all hits. Like how the venomous spiders don't poison with every attack, just critical hits.
Remember to NOT drop items even if it seems you're collecting a lot of them. There is a cauldron room (eventually) where you trade in an item of each category (weapon, shield, helm) to gain a scroll.
Beware, there is no autosave nor save function - the badge requires you to go through all 15 levels in one sitting. That said, the levels do go by quickly.
*Almost attacks last city in USA* Due to a zombie housing issue, half your army is gone. Damn. Oh well, time to buy more zombie heros. Never used the mobster zombies to attack >.>
Aren't these optical illusions all based off of paintings that artists have done in the past? If we're going so far as to claim copying is bad...there's also that imitation is the best/sincerest form of flattery.
Of course the 1 million% increase in production upgrade and the activator upgrade for said upgrade (both costing 1 coin) is an April Fool's joke. I feel like banging my head against the wall...while laughing. XD