Overall a very solid game, however it lacks things from Kingdom Rush: Vengeance. For example, towers now only have 2 upgrade paths instead of 3. And there is still a lot of content to be added, there are a lot less towers then in Kingdom Rush: Vengeance (for now). I would recommend only to buy this game now if you really want to support the developers, otherwise wait until they add more content.
I beat the main campaing in 5-6 hours.

New ideas that have been implemented very well:
- 2 Hero system
- Tons of new mechanics for enemy mobs

Overall a very solid game, however it lacks things from Kingdom Rush: Vengeance. For example, towers now only have 2 upgrade paths instead of 3. And there is still a lot of content to be added, there are a lot less towers then in Kingdom Rush: Vengeance (for now). I would recommend only to buy this game now if you really want to support the developers, otherwise wait until they add more content. I beat the main campaing in 5-6 hours. New ideas that have been implemented very well: - 2 Hero system - Tons of new mechanics for enemy mobs