Nice game, there's no game bug I've encountered.
Unfortunately the game rules/difficulty are a bit inadequate, as you can just win by putting as many pawns as possible. The game drags on (I've reached level 70, is there an end?). There is no strategy to plan and no reason to put any piece other than spam pawns (it's a common problem of game where you can scale the cheapest option).
It's quite surprising how the pieces move in "real time". I would have expected more chess like rules (one piece per turn). Which might be why having lots of units is very powerful. The AI playing you can also be stupid/make some blunders which can be frustrating.