Overall a good tower defence game, if it weren't for the bugs.
- a warp+stealth enemy managed to warp through a wall, cutting his path in half, making me destroy towers to catch up because the towers ignored him without me nearby. He touched a core which forced me to restart the level for gold.
- the waves and bosses are randomized each play, so a boss could be flying in one round and something else the next. In the 13th level the first boss was flying and even spawned at the entrance closest to the cores, of course it was impossible to kill him before touching one - restart. Next round I prepared as good as possible for him and I got another boss instead, duh.
- the worst bug: after I played through last stand mode and buying the upgrade for double UP from monsters, I wasn't able to choose the difficulty of levels anymore. Now all levels automatically start as normal, I can't play them on hardcore, which I only did with the first one yet. I've played through all levels on gold, spent a good 8h total, but can't get the red medal anymore, even though I'm already overpowered enough to easily steamroll through them on hardcore. There's no option to erase data and start over either, but honestly I also don't want to grind another 8h just for a chance to not encounter the bug again.