I liked the sheer amount of content it seems to have, many stages, powerups, characters and rooms in your fortress.
But the gameplay is sort of all over the place. When it started, I wasn't sure what to do, tried walking and discovered I was the old medieval doctor guy. I couldn't interact with. When I approached the notebook it started the stage choice and I didn't understand the tower/fortress message stuff, also I didn't find the option to come back to the fortress. So I decided to go mountain peak, clicking next even if all it showed me were those locks as if I couldn't go there.
The tank fighting feels alright, although the tank feels a bit too fast and his attacks are way too slow. Some sound effects for shooting/enemies dying would go a long way. I didn't understand what happened when it teleported me saying I found a safe area or something. Then walking through my fortress I found a dude I seemed to have saved. Also, for some reason some of the enemies simply disappeared as I kept running away from them and shooting. Especially the giant guys in the frozen peak.
On my second run I understood how to use a tower, in the first one I tried dragging or clicking the areas in the map and nothing happened. That's on me too, I didn't try clicking the tower then the space, but a small explanation or tutorial would be appreciated.
The game has an impressive amount of content, but it needs some tweaking in the movement and some juice in the effects and sound areas. And some tutorials.