Thanks for Kyron for providing some sprites and music.

You are in medieval castle and you need to protect it with the limited space you have. Press TAB to switch camera modes. There is a shop where you can build the defence and repair walls. On the left you can see health bars of your gates, and on the bottom left corner there is a round counter with a next round button, launch next round when you are ready! At the end of every round you get a 1 card from 3 to pick and you need to place them in the grid with limited space. When you are ready just click "Lock the grid" and all the buffs (buffs are applying on turrets only) will add up, but the block you just placed you cannot replace later so be wise with the placement of the blocks! You can replace turrets with selling! Have fun!