Thanks for playing, I'm glad you liked it.
The shopkeeper tries to scam you on the first level and keeps increasing the price of the potion so that you can't afford it for a few turns. Maybe the first map is not the best place for a gimmick like that but I'm not sure where else to put it.
The level bar unlocks upgrades but that's not super relevant in the demo, you only get one towards the end. That's the only thing that you really keep between maps, my goal is to focus more on the strategy aspect rather than the rpg part. I'll consider either having other rewards for finishing levels or giving players more units earlier on to make it feel more like a strategy game.