I hope I'm not to late with this.
In terms of Quality of life:
* making the in-game camera be able to rotate the level 360 degrees would help a lot in areas that some players find hard to see their greedy little kobold.
In terms of power-ups:
* I would like to see a power-up that allows the kobold to use its gold filled belly, when large enough, to push back the peasants/normal people as a defense mechanism. But the Armored guards are immune to that power-up.
* There could also be a cute little powerup that allows you to turn one enemy NPC into a confused Kobold per level, who then proceeds to take off the attention from the player and eventually get caught, before turning back.
* It would be neat if the different paint jobs came with different power-ups unique to the paint jobs.