I've been playing this game on my phone for a while, and it showed little to no bugs. However, the PC version has a ton of bugs with battles. Sometimes, I'd see invisible units (mainly the gunner) and frequent crashes. Crashes mainly happen when I view a unit's info during a battle, this can get pretty annoying to see what a unit's ability works, how much damage it does and etc.
Besides the crashes, it's pretty fun.
It's a strategy game + long term building (found in games such as Clash of Clans) + turn-based battles.
-Many different ways to earn resources (aside from "collectors" from other games)
-A lot more units to use compared to other games
-A map system, a guild (a clan-like system), and the ability to help out your friend's base
-Can be played on multiple platforms (You can log on to the computer, and play later on your smartphone)
-Free to play
-Frequent crashes (based off of my experience)
-Forced In-game purchases (A lot of frequent ads, and some builds require "Nanopods" which are the purchasable resources, and sometimes some builds would ask a heap of them.
-Some bugs that aren't very problematic, but can be annoying
Although this game was released pretty recently, they should've spent more time testing the game before release.
I recommend getting the mobile version, but this game is still playable on PC.