Stonespine Architects: Invasion preview play and impressions

About Stonespine Architects: Invasion, from BoardGameGeek:

You demonstrated your talent as a master of the ancient minotaur art of dungeon-crafting. Master Hortgully now tasks you with defending your dungeon and training a dangerous monster from Duntam's menagerie. Defeat the invading heroes, level up your monster, earn minions, and prove your skill as a Master Architect! Stonespine Architects: Invasion is an expansion to Stonespine Architects, the critically acclaimed card-drafting and tableau building game for 1-5 players. Under the watchful eye of Master Hortgully, you must construct a perilous labyrinth filled with traps, treasures, and monsters. Now, it's time for your dungeon to prove its mettle! Using the unique abilities of your chosen guardian monster and its minions, you'll prepare each floor of your dungeon for an onslaught of heroes during the new Invasion phase. During this phase, waves of heroic adventurers with their own special abilities will delve through your chambers in search of treasure and glory. Before each Invasion phase, position your monsters strategically along the winding paths of your dungeon. Then, push your luck and defeat as many adventurers as you can and earning experience for your monster! But beware, it looks like the heroes are leveling up as they progress, becoming stronger after each Invasion... With your bosses and their minions lying in wait, will your labyrinth prove worthy of even the Queen's esteem, or lie forgotten and ruined? -description from the publisher