Did you know you can go out of the borders on the sandy area, maybe on the other area, I haven't tried, and go far enough that the floor stops generating?
I suggest a few badges,(1) Reach level 10, 5 points.(2) Defeat all enemy tribes, 15 points. (3)Unlock all monster types, 15 points. Names could be for (2) Backyard Conqueror and for (3) Diversification. + if you think these should be added. Other name suggestions are welcomed.
If you make a sequel, the heroes should be customizeable, so you could have as a choice for the three heroes of mage, warrior, bard, rogue, ranger and spearman. Also, you could have builder tiles to repair the walls and/or heal the guards.